Sulfo group-containing azo compounds having a tetrazo component radical derived from an optionally substituted 3,8-diaminodibenzofuran
This application is a continuation in-part of our copending application Ser. No. 376,512, filed July 5, 1973, and now abandoned. 
    
    
     This invention relates to new dibenzofuran derived azo dyestuffs containing sulphonic acid groups. 
     The invention provides compounds of formula I, ##STR2## in which R signifies the radical of a coupling component, R 1  signifies the radical of a coupling component differing from R, and 
     n signifies an integer from 1 to 8, 
     And the aromatic rings A and/or B may be unsubstituted or substituted by a substituent usual in azo chemistry, and the sulphonic acid group or groups may be present on rings A or B or in radicals R and R 1 . R, R 1  and rings A and B, independently may be substituted, for example, by metallizable and/or fiber-reactive groups. The compounds may be in metallized form. 
     The invention thus concerns asymmetric disazo and polyazo dyestuffs having at least one sulphonic acid group, whereby the --SO 3  H groups may occur in the aromatic rings A and/or B and/or in the radicals R or R 1 . The azo compounds of formula I preferably contain p-sulphonic acid groups, p standing for 1, 2, 3 or 4, and the --SO 3  H group or groups occur mainly in the radicals R and/or R 1 . Dyestuffs in which the aromatic rings A and B carry no further substituents are to be emphasized in particular. The invention embraces especially azo compounds of the formula: ##STR3## in which q signifies 1, 2 or 3, azo compounds of the formulae: ##STR4## in which r signifies 1 or 2 or: ##STR5## R, R 1  and rings A and B being as defined above. 
     The invention also embraces azo compounds of the formulae: ##STR6## in which R 2  signifies an arylene radical which is unsubstituted or substituted, and 
     R 3  signifies a hydrocarbon radical or acyl radical which is unsubstituted or substituted, 
     R 1  and rings A and B being as defined above. 
     In the compounds of formulae VI and VII, p preferably signifies 1, 2, 3 or 4. 
     Other preferred compounds are of the formula: ##STR7## in which t signifies 0 or 1. 
     Similarly interesting azo compounds have the formula: ##STR8## in which R 2&#39;  denotes an optionally substituted arylene radical differing from R 2 , or azo compounds of the formula: ##STR9## 
     The aromatic rings R 2  and/or R 2&#39;  may be substituted in the compounds of formulae XII and XIII by carboxylic acid groups and/or sulphonamide groups. 
     Similarly interesting azo compounds conform to the formula: ##STR10## in which X signifies a direct bond or bi- or tri- valent bridge member, 
     Y signifies a fibre-reactive radical, and v signifies 2, 3 or 4. 
     The compounds of formula XV contain preferably 3 or 4 sulphonic acid groups, such groups preferably being on the R and R 1  groups. 
     Other compounds of formula I are those of the formulae: ##STR11## or in particular of the formulae: ##STR12## in which w signifies 2 or 3. 
     As examples of fibre-reactive groups, e.g. for the radical Y, in the compounds of the invention, there may be given the radical of di- or trihalogen-1,3,5-triazines, or di-, tri- or tetra-halopyrimidines, alkylsulphonyl halogen pyrimidines, or else acyl radicals carrying a substituent detachable as an anion and/or a --C--C-multiple bond capable of addition. Such compounds are described, for example, in the British Pat. Nos. 1,144,477 and 1,145,385. Suitable reactive groups, for instance, are chloroacetyl, beta-chloropropionyl, alpha-chloroacryloyl, 2,3-dichloroquinoxdyl-6-carbonyl, beta-(4,5-dichloropyridazonyl-1)-propionyl, 4,6-dichloro-1,3,5-triazinyl-2, 2,6-dichloropyrimidyl-4, 2,5,6-trichloropyrimidyl-4, 4-chloro-6-amino-1,3,5-triazinyl-2, 4-chloro-6-(4&#39;-sulphophenylamino)-1,3,5-triazinyl-2, 5-chloro-2,6-difluoropyrimidyl-4,β-sulfatoethylsulfonyl, or ##STR13## 
     Other compounds of formula I are of the formula: ##STR14## in which R 4  signifies an alkyl radical of low molecular weight which is unsubstituted or substituted, in particular the methyl of ethyl radical, or a phenylsulfonyl radical of the formulae: ##STR15## and R&#39; signifies the radical of a coupling component of the benzene, pyrazolone-5, aminopyrazole, naphthalene or heterocyclic series or the radical of an acetoacetylamino compound, and the aromatic rings Z 1  and/or Z 2  are unsubstituted or substituted. The acetoacetylamino compound may be unsubstituted or N-substituted. 
     More specifically, the foregoing groups include the compounds of the formulae: ##STR16## or in particular those of the formulae: ##STR17## in which R 5  is an alkyl or aryl radical substituted by q --SO 3  H groups, preferably by 1 or 2 sulphonic acid groups, and otherwise unsubstituted or further substituted, such as a phenyl or naphthyl radical, or azo compounds of the formula: ##STR18## or azo compounds of the formula: ##STR19## in which R 6  signifies --OH, --O--SO 2  --R 9  or a radical of the formula ##STR20## R 7  signifies hydrogen or an acyl or hydrocarbon radical which is unsubstituted or substituted, for example an optionally substituted alkyl, phenyl or naphthyl radical, 
     R 8  signifies an alkyl or alkoxy radical of low molecular weight which is unsubstituted or substituted, acetyl, carboxyl or carboxylic acid amide radical, 
     R 9  signifies a hydrocarbon radical which is unsubstituted or substituted, 
     R 10  signifies hydrogen or a hydrocarbon radical which is unsubstituted or substituted, 
     as azo compounds of the formula: ##STR21## 
     There are likewise suitable azo compounds of the formula: ##STR22## in which the aromatic ring Z 3  is substituted by a substituent making coupling possible, for example a hydroxyl or amino group, e.g. a primary, secondary or tertiary amino group, or azo compounds of the formula: ##STR23## or of the formula ##STR24## or of the formula ##STR25## or of the formula ##STR26## or of the formula ##STR27## or of the formula ##STR28## in which the aromatic ring Z 4  is substituted by a substituent making coupling possible, such as a hydroxyl or amino group, e.g. by a primary, secondary or tertiary amino group, or the formula: ##STR29## in which the aromatic rings Z 5  and Z 6  are substituted by a substituent making coupling possible, such as a hydroxyl or amino group, e.g. by a primary, secondary or tertiary amino group or of the formula: ##STR30## or of the formula: ##STR31## or of the formula: ##STR32## or of the formula: ##STR33## or of the formula: ##STR34## or of the formula: ##STR35## or of the formula: ##STR36## or of the formula: ##STR37## or of the formula: ##STR38## or of the formula: ##STR39## or of the formula: ##STR40## or of the formula: ##STR41## or of the formula: ##STR42## or of the formula: ##STR43## or of the formula: ##STR44## or of the formula: ##STR45## or of the formula: ##STR46## or of the formula: ##STR47## or of the formula: ##STR48## or of the formula: ##STR49## Similarly suitable azo compounds conform to the formulae: ##STR50## in which R&#39; signifies the radical of a coupling component of the benzene, pyrazolone-5, aminopyrazole, naphthalene or hetero cyclic series or the radical of an acetoacetylamino compound, 
     X 1  signifies a bivalent bridge member, such as an alkylene or arylene radical which is unsubstituted or substituted, ##STR51## Y is the radical of a fibre-reactive compound, and V signifies 2, 3 or 4 
     and the aromatic ring Z 7  is substituted by a substituent making coupling possible and otherwise unsubstituted or substituted, 
     or of the formula: ##STR52## 
     Suitable reactive groups are for instance the radicals already mentioned, or in particular 4,6-di-chloro-1,3,5-triazinyl-2,2,6-dichloro-or 2,6-difluoropyrimidyl-4. 
     Suitable compounds of this type are of the formula: ##STR53## in which one or two X 2  signifies hydrogen and the others signify chlorine, bromine or fluorine, 
     or compounds of the formula: ##STR54## in which X 3  signifies hydrogen, chlorine bromine 
     or fluorine, and 
     X 4  signifies chlorine, bromine or fluorine, 
     or in particular of the formula: ##STR55## 
     By analogy all the compounds of the formulae LXX to LXXIII may be of similar structure to those of formulae II to VII or XVI to XXI with regard to their asymmetric structure and the position of the --SO 3  H groups in the molecule. 
     The invention also includes those azo compounds of formula I in which R and/or R 1  denote radicals of compounds containing metals; the new azo compounds of formula I may be used also to produce metalliferous compounds of formula I, if compounds of formula I in which the aromatic rings A and/or B and/or the radicals R and/or R 1  contain groups capable of forming metallic complexes and occupying an advantageous ortho position to the azo groups are treated in the substance or on the fibre with metal-releasing compounds. Thus they may be, for example, 1:1 and/or 1:2 metal complex dyestuffs. Accordingly, they may contain a metal atom such as iron, cobalt, copper, nickel, manganese, aluminum chromium or zinc in a complex bond. 
     The dyestuffs indicated below may be obtained as metal complex dyestuffs by metallizing the corresponding non-metalliferous dyestuffs, which can be done during manufacture or on the fibre, using known methods. They correspond to the formula: ##STR56## or of the formula: ##STR57## in which R&#39; 10  and R&#39; 11  signify the radical of a coupling component of the benzene, pyrazolone-5, aminopyrazole, naphthalene or acetoacetylamino series, 
     X 5  and X 6  signify --NH--R 10 , --O-- or --COO--, and are preferably in ortho positions to the azo group, 
     and Me is a metal atom such as copper, nickel, iron, cobalt, manganese or chromium, 
     or of the formula ##STR58## or of the formula ##STR59## or of the formula: ##STR60## or in particular of the formula: ##STR61## in which the aromatic rings Z 8  and/or Z 9  and/or Z 10  may be further substituted. Me preferably signifies Cu. 
     By analogy all the compounds of the formulae LXXIV to LXXIX may be of similar structure to those of the formulae II or VII or XVI to XXI in respect of their asymmetric structure and the position of the --SO 3  H groups in the molecule. 
     Preferred polyazo compounds correspond mainly to the formula: ##STR62## in which R 12  signifies the radical of a coupling 
     component of the benzene, pyrazolone-5, aminopyrazole or naphthalene series, 
     R 13  signifies the radical of a diazo or coupling component of the benzene or naphthalene series, and 
     t signifies 0 or 1. 
     Examples of R 12  are hydroxy- and dihydroxybenzene and amino- and diamine-benzene. 
     Examples of R 13  are aminobenzenesulphonic acid, aminonaphthalenesulphonic acid, etc. 
     Suitable coupling components, such aS R, R 1 , R 2 , R&#39; 2 , R&#39;, R&#39; 10 , R&#39; 11 , R 12  and R 13 , are those of the aromatic series, e.g. those of the benzene or naphthalene series carrying a substituent which makes the coupling possible. They belong for instance to the aminobenzene, hydroxybenzene, aminonaphthalene or hydroxynaphthalene series. Coupling components of the heterocyclic series may be employed too, such as those of the pyrazole (e.g. the pyrazolone-5 or aminopyrazole series), quinoline, hydroxyquinoline, barbituric acid, indole or carbazole series. Equally suited are coupling components with a methylene group capable of further coupling; and for example acylacetylamino compounds like acylacetylaminoalkyl or aryl compounds. 
     Examples of suitable coupling components are: 
     alkylphenols, 
     1,3-dihydroxybenzene, 
     2-hydroxynaphthalene, 
     1-hydroxy-4-alkoxynaphthalenes, 
     2-hydroxy-8-acetylamino-6-methylsulphonylaminonaphthalene, 
     1-hydroxy-6- and 7-aminonaphthalene, 
     1-hydroxy-6- and 7-methylaminonaphthalene, 
     1-hydroxg-6- and 7-phenylaminonaphthalene, 
     1-hydroxy-(4&#39;-methoxyphenylamino)-naphthalene, 
     1-hydroxy-(2&#39;,4 &#39;,6&#39;-trimethylphenylamino)naphthalene, etc. 
     Aromatic coupling components with a primary or secondary amino group, such as aminobenzene and its derivatives, e.g., 
     1,3-diaminobenzene, 
     1-aminonaphthalene, 
     2-aminonaphthalene, 
     2-phenylaminonaphthalene, 
     2-methylamino-5-hydroxynaphthalene, 
     2-hydroxynaphthalenesulfonic sulphonic acids such as 
     2-hydroxynaphthalene-4-, 5-, 6-, 7- or 8-. sulphonic acid; 2-hydroxynaphthalenesulfonic acids disulphonic acid such as 2-hydroxynaphthalene-4,6-, 4,7-, 4,8-, 5,8-, and 6,8- disulphonic acids, 2-amino-8-hydroxynaphthalene-6-sulphonic acid, 1-aminonaphthalene-4-sulphonic acid, 1-hydroxynapthalene-3,6- disulphonic acid; 1-hydroxynapthalene trisulphonic acids such as 1-hydroxynaphthalene-3,6,8-trisulphonic acid. 
     Heterocyclic components are for instance 1-phenyl-3-methylpyrazolone-5, 
     1-(sulphophenyl)-3-methylpyrazolone 
     1-chlorophenyl)-3-methylpyrazolone-5, 
     1-(cyanophenyl)-3-methylpyrazolone-5, 
     1-(3&#39;-halophenyl)-3-methylpyrazo lone-5, 
     1-(3&#39;-cyanophenyl)-3-methylpyrazolone-5, 
     1-(alkylphenyl)-3-methylpyrazolone-5, and 
     1-(di- or trialkylphenyl)-3-methylpyrazolone 5 
     Aliphatic coupling components with an active methylene group are for example: 
     1-acetoacetylarylamides like 
     1-acetoacetylaminobenzene etc., 
     1-acetoacetylamino-2-ethylhexane, 1-acetoacetylaminobutane etc. 
     The coupling components and all radicals of aromatic character may be substituted by substituents usual in dyestuffs chemistry, e.g. by halogen atoms, nitro and amino such as primary, secondary or tertiary amino, cyano, thiocyano, hydroxyl, alkyl, alkoxy, trifluoroalkyl, trichloroalkyl, mercapto, alkyl- or phenylmercapto, phenyl, cycloalkyl, phenoxy, alkylamino, dialkylamino, phenylamino, acyl, acyloxy, --COOH, --SO 3  H; acylamino and sulphonarylamide groups like acetylamino, benzoylamino, alkylsulphonyl, arylsulphonyl, sulphonamide, sulphonalkylamide, sulphondialkylamide; arylazo such as phenylazo, diphenylazo etc,. Preferred acyl groups correspond to the formula R 14  --Y 1  or R 14  &#39;--Z--, in which R 14  is a hydrocarbon radical substituted as required, carrying the substituents listed above and/or containing hereto atoms, preferably an alkyl or phenyl radical substituted as required, most preferably unsubstituted C 1-4  alkyl or phenyl. 
     Y 1  is a radical of the formula --O--CO--, --SO 2  -- or --O --SO 2-- ,  R 14  &#39;is a hydrogen atom or has one of the significances of R 14 . 
     Z is a radical of the formula --CO--, --NR 14  &#34;--CO-or --NR 14  &#34;--SO 2  -- and R 14  &#34; denotes a hydrogen atom or one of the significances of R 14 . 
     Halogen stands for bromine, fluorine or iodine, though in particular for chlorine. 
     Preferred salt forms of the compounds of formula I are the alkali metal, e.g. sodium potassium and lithium salt forms, the ammonium salt forms and the mono-, di- and tri-C 1-4  -alkyl- and C 1-4  hydroxyalkylammonium salt forms. The most preferred such forms being the alkali metal and ammonium salt forms, particularly the sodium salt forms. 
     Hydrocarbon radicals denote alkyl, aryl or cycloalkyl radicals mainly. Alkyl radicals may have 1 to 18, 1 to 12, though preferably 1 to 6, carbon atoms; preferably also they denote alkyl radicals of low molecular weight with 1, 2, 3 or 4 carbon atoms. Aryl or arylene radicals stand chiefly for phenyl or naphthyl radicals, or else phenylene or naphthylene radicals capable of carrying the above-named substituents. Cycloalkyl radicals are preferably 5- or 6-link ring systems though more preferably cyclohexyl radicals which may be substituted by alkyl, alkoxy or halogen as necessary. 
     Alkoxy radicals contain preferably 1, 2, 3 or 4 carbon atoms in the alkyl radical. As examples of bivalent links, e.g. X and X 1 , may be given unsubstituted or substituted C 1-12  alkylene or arylene radicals, which former radicals may be preceded, interrupted or followed by a hetero atom or group containing hetero atoms, e.g. by ##STR63## --O--, --S--, or --N (R 10 )-- where R 10  is as defined above preferably hydrogen or C 1-4  alkyl. 
     Preferred substituents in the aromatic rings Z 1  to Z 10  are for example halogen, alkyl or alkoxy. 
     These rings Z 1  to Z 10  may also have a --CH═CH--CH═--CH═CH--CH═CH-- groups condensed thereon. 
     the compounds provided by the present invention which are of particular interest may be represented by formula IA, ##STR64## in which Ra and R 1a  are different and each signifies a coupling component of the benzene, naphthalene, pyrazolone-5 or aminopyrazole series or an acetoacetylamino radical, 
     X signifies hydrogen or --SO 3  H, and 
     pa signifies 1, 2, 3 or 4, 
     the compounds optionally bearing metallised or fibre reactive groups and being in free acid or salt form. 
     As a first class compounds falling within the general formula IA, may be given the compounds of formula IAa, ##STR65## in which X is as defined above, and R 2a  and R 3a , which are different, either each signifies a radical selected from those of formulae (a), (b), (c) and (d), ##STR66## in which R 4a  signifies hydrogen, hydroxy, --SO 3  H or a group of the formula ##STR67## and R 5a  signifies hydroxy, amino, carboxyl, N,N-di(C 1-4 )alkylamino, N-(C 1-4 )-alkyl-N-(C 1-4 )alkylphenylamino, N-(C 1-4 )alkyl-N-(C 1-4 )alkylphenylaminosulphonyl, N-phenylamino, N-(C 1-4 )alkylamino or N-(C 1-4 )alkyl-N-benzylamino, ##STR68## in which R 6a  signifies --NH 2  or --OH, 
     R 7a  and R 8a , independently, signify hydrogen, C 1-4  alkyl, halogen or --SO 3  H, and 
     R 9a  signifies hydrogen, C 1-4  alkyl, halogen or cyano, ##STR69## in which R 10a  signifies --OH, --NH 2  or acetylamino, 
     R 11a  signifies hydrogen, carboxyl or --OH, 
     R 12a  signifies hydrogen, --SO 3  H,C 1-4  alkyl, C 1-4  alkylsulphonyl, C 1-4  alkoxy, C 1-4  -alkylamino, phenylamino, C 1-4  -alkoxyphenylamino or trimethylphenylamino, and 
     R 13a  and R 14a , independently, signify hydrogen or --SO 3  H, ##STR70## in which R 15a  signifies 2-ethylhexyl, butyl, 
     C 1-4  -(alkyl)phenyl, C 1-4  -alkoxyphenyl, di-(C 1-4 )alkoxyphenyl, phenyl or disulfonaphthyl 
     or one of R 2a  and R 3a  signifies a radical selected from the following formulae (e), (f), (g), (h) and (i), the other signifying a radical of the above formulae (a), (b), (c) and (d), ##STR71## in which R 16a  signifies C 1-4  -alkyl or ##STR72## in which R 17a  signifies hydrogen or C 1-4  alkyl, 
     and 
     R 18a  signifies hydrogen or C 1-4  alkyl, ##STR73## in which R 16a  is as defined above, ##STR74## in which R 19a  signifies hydrogen or C 1-4  -alkyl 
     R 20a  signifies hydrogen, halogen, C 1-4  alkyl or C 1-4  alkoxy, and 
     R 22a  signifies a 4,6-dichloro-1,3,5-triazinyl-2; 2,6-dichloropyrimidyl-4; 2,5,6-trichloropyrimidyl-4; 4-chloro-6-(4&#39;-sulphophenylamino)-1,3,5-triazinyl-2; 4-chloro-6-(phenylamino)1,3,5-triazinyl-2 or 5-chloro-2,6-difluoropyrimidyl-4radical, ##STR75## in which R 22a  is as defined above, and 
     R 21a  signifies hydrogen or --SO 3  H, ##STR76## in which R 22a  is as defined above, or R 2a  signifies a radical of formula (a), above, and R 3a  signifies a radical of formula (j), ##STR77## the compounds of formula IAa containing 2, 3, or 4 sulphonic acid groups and being in free acid or salt form. 
     As will be appreciated, the radicals of formula (a) and (c) should contain groups enabling coupling to take place. 
     In the compounds of formula IAa, the preferred radicals of formula (a) are of formulae (a 1 ) and (a 2 ), ##STR78## in which R 30a  signifies carboxyl, hydroxyl, 
     N-(c 1-4 )alkyl-N-(C 1-4 )alkylphenylaminosulphonyl, N,N-di(C 1-4 )alkylamino, N-mono-(C 1-4 )-alkylamino, N-phenylamino, 
     N-(c 1-4 )alkyl-N-benzylamino or ##STR79## and R 31a  signfifies hydrogen or hydroxyl, 
     with the proviso that where R 30a  signifies 2-hydroxy-5-sulphophenylazo, R 31a  signifies hydroxyl, ##STR80## the preferred radicials of formula (b) being of formula (b 1 ) ##STR81## in which R 33a  and R 35a , independently, signify hydrogen or chlorine, and 
     R 34a  signifies hydrogen, --SO 3  H or chlorine, 
     the preferred radicals of formula (c) being of formula (c 1 ) ##STR82## in which R 36a  signifies +OH, --NH 2  or acetylamino, 
     R 37a  signifies hydrogen, hydroxyl, carboxy or --SO 3  H, and 
     R 38a , R 39a  and R 40a , independently, signify hydrogen or --SO 3  H, 
     the radical of formula (c 1 ) containing from 1 to 3 --SO 3  H groups, the preferred radicals of formula (d) being of formula (d 1 ), ##STR83## in which R 41a  signifies phenyl, dimethoxyphenyl, methyl- or methoxyphenyl, 2-ethylhexyl or disulfonaphthyl, 
     the preferred radicals of formula (e) being of formula (e 1 ) ##STR84## in which R 42a  signifies methyl, ethyl, phenylsulphonyl or p-methylphenylsulphonyl, and 
     R 43a  signifies hydrogen or methyl, the preferred radicals of formula (f) being of formula (f 1 ) ##STR85## in which R 42a  is as defined above, the preferred radicals of formula (g) being of formula (g 1 ), ##STR86## in which R 22a  is as defined above, 
     R 44a  signifies hydrogen, methyl, chlorine or methoxy, and 
     R 45a  signifies hydrogen or methyl, the preferred radicals of formula (h) being of formula (h 1 ) ##STR87## in which R 22a  is as defined above, and 
     R 46a  signifies hydrogen or --SO 3  H, and the preferred radicals of formula (i) being of formula (i 1 ), ##STR88## in which R 22a  is as defined above. 
     As will be appreciated, the radicals of formula (a&#39;) and (c&#39;) should contain groups enabling coupling to take place. 
     In the compounds of formula IAa, X preferably signifies hydrogen. 
     One group of interesting compounds of Formula IAa are those wherein one of R 2a  and R 3a  is a group of formula (g), (h) or (i) and the other is a group of formula (a), (b), (c) or (d). The preferred compounds of this group are those wherein any group of formula (g) is a group of formula (g 1 ), any group of formula (h) is a group of formula (h 1 ) and any group of formula (i) is a group of formula (l 1 ). 
     The most preferred compounds of formula IAa are those wherein X signifies hydrogen, R 2a  signifies a radical of formula (e 1 ), (f 1 ), (g 1 ), (h 1 ) or (i 1 ) and R 3a  signifies (a 1 ), (a 2 ), (b 1 ), (c 1 ) or (d 1 ) or R 2a   signifies a radical of formula (a 1 ), (a 2 ), (b 1 ), (c 1 ) or (d 1 ) and R 3a  signifies a radical of formula (e 1 ), (f 1 ), (g 1 ), (h 1 ) or (i 1 ) or R 2a  signifies a radical of formula (a 1 ) and R 3a  signifies a radical of formula (j). 
     As a second class of compounds falling within the general formula IA, may be given the compounds of formula IAb, ##STR89## in which X signifies hydrogen or -SO 3  H, 
     R 2b  signifies a radical of formula (e) or (f) above, preferably of formula (e 1 ) or (f 1 ), above, and 
     R 3b  signifies a radical of formula (k), (l) or (m), ##STR90## in which R 23b , R 24b  and R 24b  1, independently, signify hydrogen or -SO 3  H, and in which, of the two free bonds, one is in α-position, and the other in adjacent β-position thereto, ##STR91## in which R 25b  signifies hydrogen or --SO 3  H, ##STR92## in which R 27b  signifies hydrogen or C 1-4  alkyl, the compounds of formula IAb containing 2, 3 or 4 sulphonic acid groups and being in free acid or salt form. 
     The preferred compounds of formula IAb are those in which R 2b  signifies a radical of formula (e 1 ) or (f 1 ) and R 3b  signifies a radical of formula (k 1 ) or (l 1 ), ##STR93## 
     As a third class of compounds falling within the general formula IA, may be given the compounds of formula IAc, ##STR94## ps in which R 2c  signifies a radical of formula (e) or (f), above, preferably of formula (e 1 ) or (f 1 ), above, and 
     R 3c  signifies a radical of formula (k), (l) or (m), above, preferably of formula (k 1 ) or (l 1 ), above, the compounds of formula IAc containing 2, 3 or 4 sulphonic acid groups and being in free acid or salt form. 
     As a fourth class of compounds falling within the general formula IA, may be given the compounds of formula IAd, ##STR95## in which the R 3d  &#39;s, which are different, each signifies a radical of formula (k), (l) or (m), above, the compounds of formula IAd containing 2, 3 or 4 sulphonic acid groups and being in free acid or salt form. 
     The invention also provides a process for the production of compounds of formula I, which comprises coupling a tetrazo compound from a diamine of formula Ia ##STR96## in which rings A and B are as defined above, with a coupling component of formula Ib, 
     
         R--H                                                       Ib 
    
     in which R is as defined above, and with a coupling component of formula Ic, 
     
         R.sub.1 --H                                                Ic 
    
     in which R 1  is as defined above. 
     It will be clear that the various preferred azo compounds described hereinbefore may be prepared by coupling the appropriate starting materials. It will also be clear that once the basic dye structure is formed according to the invention, it may be modified in conventional manner. 
     Thus, for example, the azo compounds of formula VI or VII may be obtained by etherifying or acylating, e.g. tosylating, a compound of the formula: ##STR97## or a compound of the formula: ##STR98## 
     The azo compounds of formula XII may be obtained by etherifying or acylating, e.g. tosylating, a compound of the formula: ##STR99## 
     The azo compounds of formula XV can be obtained by coupling the diazo compound from an amino compound of the formula: ##STR100## in which y&#39; may signify t, v or w, with a coupling component of the formula: 
     
         (HO.sub.3 S).sub.y&#34; --R.sub.1 --H 
    
     in which y&#39; and y&#34; total 2 to 4. 
     The azo compounds of formula XV can also be obtained by reacting a compound of the formula: ##STR101## with a compound which will provide a fibre-reactive radical. 
     It is also clearly possible to employ compounds of formula Ia which are substituted by the SO 3  H group, such as the diamine of the formula: ##STR102## 
     Such intermediates are known or may be prepared in conventional manner from known starting materials. 
     The coupling reaction may be effected in conventional manner. It is preferred to effect a first coupling in water at a pH of 6 to 8 and temperatures from -10° to +20° C, more preferably at 5° to 10° and suitably in the presence of a coupling accelerator like pyridine, urea, etc. The coupling of the resulting compound with the second coupling component is also effected in water usually, at at a pH from 9 to 12, preferably between 10 and 11, at temperatures from -10° to +20° C, preferably from 10° to 20°. The usual coupling accelerators may be used for this coupling reaction too. 
     Acylation or tosylating is also effected in conventional manner and may be effected in water at at a pH of 8 - 10, preferably around 9, and at temperatures from 30° to 80° C, e.g. around 50° C, working preferably in the presence of sodium carbonate or disodium phosphate. A neutral solvent may be added too, such as dichlorobenzene. 
     Etherification, e.g. with dimethyl or diethyl sulphate, is effected mainly in water with a pH- of 8 to 10 and temperatures of 30° to 80° C, preferably 40° - 60° C and in the presence of, for instance, sodium or potassium carbonate or bicarbonate. 
     The introduction of a reactive component, i.e. transposition of the hydrogen atom of a free --OH or free amino group with the halogen atom or a sulphate group of a reactive component, can likewise be effected in water with a pH- of 5 to 7 and at temperatures from 20° to 40° C, chiefly in the presence of sodium acetate or sodium bicarbonate. 
     Metallization is generally performed in water at a pH- of 9 to 12 and at temperatures from 40° C to boiling point, preferably at 50° - 80° C and in the presence of sodium hydroxide. Metallization is preferably effected with metal-donating agents, such as those donating chromium, iron, cobalt, copper, manganese or nickel. Copper-donating compounds include, for example, copper acetate, chloride and formate; nickel-donating compounds include nickel formate, acetate and sulphate; chromium-donating compounds are chromium trioxide, fluoride, sulphate, formate, and acetate and, chromium ammonium sulphate; sodium chromate or bichromate may be employed as well. Typical manganese-, cobalt- or iron-donating compounds are manganese, cobalt or iron formate, acetate or sulphate. 
     The compounds are highly coloured and are indicated for dyeing or printing natural or synthetic polyamides, like wool, silk and nylon, cotton, mordanted cotton, cellulosic fibres or regenerated cellulose fibres, basically modified polypropylene fibres, synthetic polyamides or polyesters modified by acid groups, as well as paper and leather. The polyazo compounds are particularly indicated for dyeing or printing leather. 
     The anionic compounds of formula I and their metal complexes have generally good light- and wet-fastness on the substrates named above, also good fastness to washing, milling and potting, water, perspiration, abrasion and sea water. The substrates are dyed in brilliant, level tones with good migration. They have a good neutral affinity and build-up capability, and cover stripily dyeing nylon fabric. They have good substantivity on cotton and paper. In addition they have good fastness to solvents, acids and alkalis. 
     Natural and synthetic polyamides and cellulose fibres dyed with the compounds of formula I which are reactive dyestuffs, possess good light-fastness and good resistance to water, sea water, milling and perspiration. Their fixation capacity is also very good. 
     The compounds may be used for dyeing or printing using methods conventional for the broad class of dyestuff and appropriate for the particular substrate. 
     An important group of dyestuffs - the so-called benzidine dyestuffs, i.e. those derived from benzidine - has been withdrawn from the market because of the danger to health, or the cessation of the production of these dyestuffs is being considered. Consequently, there is a real need to replace this valuable group of dyestuffs by others of similar type and shading. The compounds of the present invention are not derived from benzidine, and it is thought that their production will be less dangerous. 
     In the examples that follow, the parts are parts by weight, the percentages are percentages by weight, and the temperatures are given in degrees Centigrade. 
    
    
     EXAMPLE 1 
     19.8 parts of 3,8-diaminodibenzofuran are suspended in 150 parts water and 25 parts hydrochloric acid at 0° - 2°. Then a solution consisting of 14 parts sodium nitrate in 60 parts water is dropped into the suspension, keeping the temperature between 0° and 5°. 
     After 30 minutes a solution consisting of 22.4 parts 2-hydroxynaphthalene-8-sulphonic acid, 8 parts sodium carbonate and 200 parts water is dropped into the tetrazo solution. The coupling mass is stirred for 2 hours at 0° - 5°. After this a solution consisting of 25.4 parts 1-(4&#39;-sulfophenyl)-3-methyl-5-pyrazolone, 30 parts of a 30% aqueous sodium hydroxide solution and 100 parts water is added to the coupling mass. The coupling mixture is stirred for 4 hours, during which the temperature may be allowed to rise to room temperature. The pH of the suspension is adjusted to 7, after which the dyestuff precipitated is removed by suction, washed with an aqueous sodium chloride solution and dried at 100°. The dyestuff will dye natural and synthetic polyamides from neutral to weakly acid bath to a pure orange shade with good wet- and light-fastness. The dyestuff of the formula: ##STR103## will also dye cotton, paper and leather with good fastnesses. 
     EXAMPLE 2 
     If the tetrazotized 3,8-diaminodibenzofuran is coupled first onto 1-(4&#39;-sulfophenyl)-3-methyl-5-pyrazolone and then onto 2-hydroxynaphthalene-8-sulphonic acid under the reaction conditions described in Example 1, an isomer dyestuff is obtained with the formula: ##STR104## 
     The dyestuff will dye natural and synthetic polyamide from neutral to weakly acid bath to a pure scarlet tone with the same good wet- and light-fastness as the dyestuff described in Example 1. 
     In Table I that follows, the structure of further dyestuffs is given. These can be produced by the method indicated in Example 1, and correspond to the formula: ##STR105## 
     In the columns for R, R 1  and X&#39; the initial compound and radicals for producing the dyestuff (a) are given. A further column I gives the dyeing shade on synthetic polyamide (nylon), cellulose and leather. 
     
                                           Table I                                 
__________________________________________________________________________
   Coupling component                                                     
                     Coupling component                                   
No.                                                                       
   R             X&#39;  R.sub.1         I                                    
__________________________________________________________________________
 3 2-hydroxynaphtha-                                                      
                 H   1-phenyl-3-methyl-                                   
                                     orange                               
   lene-8-sulphonic  5-pyrazolone (4)                                     
   acid (4)                                                               
 4 &#34;             &#34;   1-(4&#39;-chloro)-phenyl-                                
                                     orange                               
                     3-methyl-5-pyrazolone                                
                     (4)                                                  
 5 1-(2&#39;,5&#39;-dichloro-                                                     
                 &#34;   2-hydroxynaphthalene-                                
                                     orange                               
   4&#39;-sulpho)-phenyl-                                                     
                     8-sulphonic acid (1)                                 
   3-methyl-5-pyrazolone                                                  
   (4)                                                                    
 6 2-hydroxynaphthalene                                                   
                 &#34;   2-hydroxynaphthalene                                 
                                     scarlet                              
6,8-disulphonic  (1)                                                      
   acid (1)                                                               
 7 &#34;             &#34;   1-hydroxynaphthalene                                 
                                     scarlet                              
                     (2)                                                  
 8 1-hydroxynaphthalene-                                                  
                 &#34;   &#34;               red                                  
   3,6-disulphonic                                                        
   acid (2)                                                               
 9 1-hydroxynaphthalene                                                   
                 H   1-phenyl-3-methyl-                                   
                                     orange                               
3,6-disulphonic  5-pyrazolone (4)                                         
   acid (2)                                                               
10 2-amino-8-    &#34;   1-hydroxynaphthalene                                 
                                     red                                  
   hydroxynaphthalene                                                     
4-sulphonic acid (2)                                                      
6-sulphonic acid                                                          
   (acid-coupled) (1)                                                     
11 1-aminonaphthalene-                                                    
                 &#34;   &#34;               orange                               
   4-sulphonic acid (2)                                                   
12 1-phenyl-3-methyl-                                                     
                 &#34;   1-amino-8-hydroxynaphthalene                         
   5-aminopyrazole (4)                                                    
3,6-disulphonic acid                                                      
   red                                                                    
                     (alkaline-coupled) (7)                               
13 &#34;             &#34;   1-amino-8-hydroxynaphthalene                         
4,6-disulphonic acid                                                      
   red                                                                    
                     (alkaline-coupled) (7)                               
14 N-ethyl-N-    H   2-hydroxynaphthalene-                                
                                     red                                  
   benzylaniline-3&#39;- 6-sulphonic acid (1)                                 
   sulphonic acid (4)                                                     
15 n,n-diethylaniline (4)                                                 
                 H   &#34;               red                                  
16 N-methylaniline (4)                                                    
                 H   1-hydroxynaphthalene-                                
                                     red                                  
                     3-sulphonic acid (2)                                 
17 N-phenylaniline                                                        
                 H   &#34;               red                                  
18 N-ethyl-N-    H   2-hydroxybenzoic                                     
                                     red                                  
   benzylaniline-3&#39;- acid (5)                                             
   sulphonic acid (4)                                                     
19 &#34;             SO.sub.3 H                                               
                     &#34;               red                                  
20 1-hydroxynaphthalene-                                                  
                 &#34;   1-phenyl-3-methyl-5-                                 
                                     red                                  
   3,6-disulphonic   pyrazolone (4)                                       
   acid (2)                                                               
21 2-hydroxynaphthalene-                                                  
                 &#34;   &#34;               red                                  
   6-sulphonic acid (1)                                                   
22 2-hydroxynaphthalene-                                                  
                 H   1-(4&#39;-sulpho)-phenyl-3-                              
                                     red                                  
   8-sulphonic acid (1)                                                   
                     methyl-5-pyrazolone                                  
                     (4)                                                  
23 2-hydroxynaphthalene-                                                  
                 SO.sub.3 H                                               
                     2-hydroxynaphthalene (1)                             
                                     red                                  
   8-sulphonic acid (1)                                                   
24 1-(4&#39;-sulfophenyl-3-                                                   
                 &#34;   2-hydroxynaphthalene-                                
                                     red                                  
   methyl-5-pyrazolone (4)                                                
                     8-sulphonic acid (1)                                 
25 N-ethyl-N-benzylaniline                                                
                 &#34;   2-hydroxynaphthalene                                 
                                     red                                  
   (4)               (1)                                                  
26 &#34;             &#34;   1-hydroxynaphthalene                                 
                                     red                                  
                     (2)                                                  
27 &#34;             &#34;   2-hydroxynaphthalene-8-                              
                                     red                                  
                     sulphonic acid (1)                                   
28 N-ethyl-N-benzylaniline                                                
                 &#34;   1-hydroxynaphthalene                                 
                                     red                                  
3&#39;-sulphonic acid (4)                                                     
                 (2)                                                      
29 1-acetoacetylamino-2,5-                                                
                 &#34;   2-hydroxynaphthalene-8-                              
                                     orange                               
   dimethoxybenzene (CH.sub.2)                                            
                     sulphonic acid (1)                                   
30 Acetoacetylaminobenzene                                                
                 &#34;   &#34;               orange                               
   (CH.sub.2)                                                             
31 Acetoacetic acid-                                                      
                 SO.sub.3 H                                               
                     2-hydroxynaphthalene-                                
                                     orange                               
   o-anisidide (CH.sub.2)                                                 
                     8-sulphonic acid (1)                                 
32 1-acetoacetylamino-                                                    
                 &#34;   &#34;               orange                               
   2-ethylhexane (CH.sub.2)                                               
33 1-(4&#39;-sulfophenyl-                                                     
                 &#34;   Acetoacetylaminobenzene                              
                                     yellow                               
   3-methyl-5-pyrazolone                                                  
                     (CH.sub.2)                                           
   (4)                                                                    
34 N-ethyl-N-benzylaniline                                                
                 &#34;   1-hydroxynaphthalene-                                
                                     red with                             
   (4)               3-sulphonic acid (2)                                 
                                     bluish                               
                                     tinge                                
35 1-hydroxynaphthalene-                                                  
                 H   1-phenyl-3-methyl-5-                                 
                                     orange                               
   3,6,8-trisulphonic                                                     
                     pyrazolone (4)                                       
   acid (2)                                                               
36 2-hydroxynaphthalene-                                                  
                 H   &#34;               orange                               
   3,6,8-trisulphonic                                                     
   acid (1)                                                               
37 2-amino-8-        2-hydroxybenzoic                                     
                                     red                                  
   hydroxynaphthalene                                                     
                     acid (5)                                             
6-sulphonic acid                                                          
   H                                                                      
   (acid coupling) (1)                                                    
38 1-phenyl-3-methyl-                                                     
                 H   2-hydroxybenzene-1-                                  
                                     orange                               
   5-pyrazolone-4&#39;   carboxylic acid (5)                                  
   sulphonic acid (4)                                                     
39 2,4,2&#39;-trihydroxyazoben-                                               
                     &#34;               brown                                
   zene-5&#39;-sulphonic acid                                                 
                 H                                                        
   (3)                                                                    
40 1-amino-8-    H   2-amino-8-      blue-                                
   hydroxynaphthalene                                                     
                     hydroxynaphthalene-6-                                
                                     black                                
   3,6-disulphonic acid (7)                                               
                     sulphonic acid (7)                                   
41 1-phenyl-3-methyl-5-                                                   
                 H   1-hydroxynaphthalene-                                
                                     orange                               
   pyrazolone (4)    3,6,8-trisulphonic acid                              
                     (2)                                                  
42 &#34;             H   2-hydroxynaphthalene-                                
                                     orange                               
                     3,6,8-trisulphonic acid                              
43 1-(4&#39;-sulfophenyl)-                                                    
                 H   1-(4&#39;-sulfophenyl)-3-                                
                                     yellow                               
   3-methyl-5-aminopyrazole                                               
                     methyl-5-pyrazolone                                  
   (4)               (4)                                                  
44 N-ethyl-benzylaniline                                                  
                 H   1-(4&#39;-sulfophenyl)                                   
                                     yellow                               
3&#39;-sulphonic acid (4)                                                     
                 3-methyl-5-pyrazolone (4)                                
45 2-hydroxynaphthalene                                                   
                 H   1-(2&#39;,5&#39;-dichloro-4&#39;-sulfo)                          
                                     orange                               
8-sulphonic acid (1)                                                      
                 phenyl-3-methyl-5-                                       
                     pyrazolone (4)                                       
46 2-hydroxynaphthalene                                                   
                 H   &#34;               orange                               
   (1)                                                                    
47 &#34;             H   2-hydroxynaphthalene-                                
                                     scarlet                              
                     6,8-disulphonic acid (1)                             
48 1-phenyl-3-methyl-5-                                                   
                 H   &#34;               yellow                               
   pyrazolone (4)                                                         
49 &#34;             H   2-hydroxynaphthalene-8-                              
                                     yellow                               
                     sulphonic acid (1)                                   
50 &#34;             SO.sub.3 H                                               
                     &#34;               yellow                               
51 &#34;             &#34;   1-hydroxynaphthalene-3-                              
                                     scarlet                              
                     sulphonic acid (2)                                   
52 1-phenyl-3-methyl                                                      
                 SO.sub.3 H                                               
                     2-hydroxynaphthalene-                                
                                     yellow                               
5-pyrazolone (4) 6-sulphonic acid (1)                                     
53 &#34;             H   1-amino-8-      red with                             
                     hydroxynaphthalene-3,6-                              
                                     bluish                               
                     disulphonic acid                                     
                                     tinge                                
                     (alkaline-coupled) (7)                               
54 &#34;             H   1-acetylamino-8-                                     
                                     &#34;                                    
                     hydroxynaphthalene-3,6-                              
                     disulphonic acid                                     
                     (alkaline-coupled) (7)                               
 54a                                                                      
   2-hydroxynaphthalene                                                   
                 H   N-ethyl-N-ethyl phenyl-                              
                                     scarlet                              
8-sulphonic acid (1)                                                      
                 aniline-3&#39;-sulphonic acid                                
                     (4)                                                  
 54b                                                                      
   2-hydroxybenzene-1-                                                    
                 H   1-phenyl-3-methyl-                                   
                                     &#34;                                    
   carboxylic acid (5)                                                    
                     pyrazolone-5-                                        
                     (4&#39;-sulphonic acid) (4)                              
__________________________________________________________________________
 
    
     EXAMPLE 55 
     31 Parts of 2-hydroxynaphthalene-6,8-disulphonic acid are dissolved in 500 parts water, adding 15 parts sodium carbonate. This solution is dropped into the tetrazo solution produced as in Example 1. After stirring for 5 hours at 0° - 5° a solution consisting of 9.5 parts phenol, 25 parts sodium carbonate and 200 parts water is added to the coupling mass. The coupling mixture is stirred for 4 hours, during which the temperature may rise to room temperature. After an intermediate isolation the disazo compound is stirred into 800 parts of water adding 30 parts sodium carbonate, heated to 50°, and portions of benzenesulphonyl chloride are stirred in at this temperature. When no more of the original substance can be detected in the thin-layer chromatogram, the suspension is cooled to 20°, filtered, washed with a 2% aqueous sodium chloride solution and dried at 100°. The product will dye natural and synthetic polyamides to a pure scarlet tone with good wet-, alkali-, light- and milling fastness. The dyestuff of the formula ##STR106## dyes cotton, paper and leather with good fastness. 
     EXAMPLE 56 
     The free hydroxy group of the disazo dyestuff in Example 55 can also be transposed under the same conditions with diethyl sulphate instead of the benzenesulphonyl chloride. The dyestuff of formula ##STR107## is obtained, which dyes natural and synthetic polyamides in to scarlet tones with good fastnesses. Table II gives the structures of further dyestuffs which can be produced according to the directions under Example 55. 
     They correspond to the formula ##STR108## in which the initial compounds and radicals for producing the dyestuff (b) are given in the columns for R 1  and X&#39;. Set out in the other columns are the radicals R 2  and R 3 , and in a further column I is the dyeing shade on nylon, cellulose and leather. 
     
                                           Table II                                
__________________________________________________________________________
   Coupling component  Radical                                            
                              Radical                                     
No.                                                                       
     R.sub.1       X&#39;  R.sub.2                                            
                              R.sub.3    I                                
__________________________________________________________________________
57 2-hydroxynaphthalene- 6,8-disulphonic acid (1)                         
                   H                                                      
                        ##STR109##                                        
                               ##STR110##                                 
                                         scarlet                          
58   &#34;             H   &#34;      CH.sub.3   &#34;                                
59   &#34;             H                                                      
                        ##STR111##                                        
                              &#34;          &#34;                                
60   &#34;             H   &#34;      C.sub.2 H.sub.5                             
                                         &#34;                                
61   &#34;             H   &#34;                                                  
                               ##STR112##                                 
                                         &#34;                                
62 1-hydroxynaphthalene-                                                  
                   H   &#34;      &#34;          &#34;                                
   3,6-disulphonic acid                                                   
   (2)                                                                    
63   &#34;             H                                                      
                        ##STR113##                                        
                              &#34;          &#34;                                
64   &#34;             H   &#34;      C.sub.2 H.sub.5                             
                                         &#34;                                
65   &#34;             H   &#34;      CH.sub.3   &#34;                                
66 1-hydroxynaphthalene- 3-sulphonic acid (2)                             
                   H   &#34;                                                  
                               ##STR114##                                 
                                         &#34;                                
67   &#34;             SO.sub.3 H                                             
                       &#34;      &#34;          &#34;                                
68   &#34;             &#34;   &#34;      C.sub.2 H.sub.5                             
                                         &#34;                                
69 2-hydroxynaphthalene- 8-sulphonic acid (1)                             
                   SO.sub.3 H                                             
                        ##STR115##                                        
                               ##STR116##                                 
                                         &#34;-70   &#34; &#34; &#34; C.sub.2 H.sub.5 &#34;   
71   &#34;             H   &#34;                                                  
                               ##STR117##                                 
                                         &#34;                                
72 1-(4&#39;-sulfophenyl-                                                     
                   H   &#34;      &#34;          yellow                           
   3-methyl-5-pyrazolone                                                  
   (4)                                                                    
73 1-(2&#39;,5&#39;-disulpho)-                                                    
                   H   &#34;      &#34;          &#34;                                
   phenyl-3-methyl-5-                                                     
   pyrazolone (4)                                                         
74   &#34;             H   &#34;      C.sub.2 H.sub.5                             
                                         &#34;                                
75   &#34;             H   &#34;      CH.sub.3   &#34;                                
76    &#34;            H                                                      
                        ##STR118##                                        
                               ##STR119##                                 
                                         orange                           
77 1-phenyl-3-methyl-5- pyrazolone-3&#39;- sulphonic acid (4)                 
                   SO.sub.3 H                                             
                        ##STR120##                                        
                              &#34;          yellow                           
78 1-phenyl-3-methyl-5-                                                   
                   &#34;   &#34;      &#34;          &#34;                                
   aminopyrazole-4&#39;-                                                      
   sulphonic acid (4)                                                     
79 N-ethyl-N-benzyl-                                                      
                   &#34;   &#34;      &#34;          &#34;                                
   aniline-3&#39;-                                                            
   sulphonic acid (4)                                                     
80   &#34;             &#34;   &#34;      C.sub.2 H.sub.5                             
                                         &#34;                                
81 2-amino-8-hydroxynaphthalene- 6-sulphonic acid (1)                     
                   &#34;   &#34;                                                  
                               ##STR121##                                 
                                         red                              
82 2-acetoacetylamino-                                                    
                   H   &#34;      &#34;          yellow                           
   naphthalene-5,7-                                                       
   disulphonic acid (CH.sub.2)                                            
83 2-aminonaphthalene-                                                    
                   H   &#34;      &#34;          orange                           
   3,6-disulphonic acid                                                   
   (1)                                                                    
84   &#34;             H   &#34;      C.sub.2 H.sub.5                             
                                         &#34;                                
85   &#34;             H   &#34;                                                  
                               ##STR122##                                 
                                         &#34;                                
86 1-hydroxynaphthalene- 3,6,8-trisulphonic acid (2)                      
                   H   &#34;                                                  
                               ##STR123##                                 
                                         red                              
87   &#34;             H   &#34;      C.sub.2 H.sub.5                             
                                         &#34;                                
88 2-hydroxynaphthalene-                                                  
                   H   &#34;      &#34;          scarlet                          
   3,6,8-trisulphonic                                                     
   acid (1)                                                               
89   &#34;             H   &#34;                                                  
                               ##STR124##                                 
                                         &#34;                                
90   &#34;             H   &#34;                                                  
                               ##STR125##                                 
                                         &#34;                                
91 2-hydroxynaphthalene-                                                  
                   H   &#34;      CH.sub.3   &#34;                                
   3,6,8-trisulphonic                                                     
   acid (1)                                                               
92 1-hydroxynaphthalene- 3,6,8-trisulphonic acid (2)                      
                   H   &#34;                                                  
                               ##STR126##                                 
                                         &#34;                                
92a                                                                       
   1-hydroxynaphthalene- 3,6-disulphonic acid (2)                         
                   H                                                      
                        ##STR127##                                        
                               ##STR128##                                 
                                         &#34;                                
__________________________________________________________________________
 
    
     example 93 
     if the tetrazotized 3,8-diaminodibenzofuran is coupled first onto phenol and then onto 2-hydroxynaphthalene-6,8-disulphonic acid under the reaction conditions described under Example 55, after condensing the hydroxyazo dyestuff obtained with p-toluenesulphochloride a dyestuff is obtained with the formula: ##STR129## 
     This dyestuff dyes natural and synthetic polyamides in pure scarlet tones with good fastnesses. 
     Listed in Table III are the structures of similar dyestuffs which can be produced following the directions given under Example 93. They correspond to the formula ##STR130## 
     
                                           Table III                               
__________________________________________________________________________
    Coupling component                                                    
                     Radical                                              
                           Radical                                        
No. R.sub.1      X&#39;  R.sub.2                                              
                           R.sub.3    I                                   
__________________________________________________________________________
 94 2-hydroxynaphthalene- 6,8-disulphonic acid (1)                        
                 H                                                        
                            ##STR131##                                    
                                      scarlet                             
 95   &#34;          H   &#34;     CH.sub.3   &#34;                                   
 96   &#34;          H                                                        
                      ##STR132##                                          
                           &#34;          &#34;                                   
 97   &#34;          H   &#34;     C.sub.2 H.sub.5                                
                                      &#34;                                   
 98   &#34;          H   &#34;                                                    
                            ##STR133##                                    
 99 1-hydroxynaphthalene-                                                 
                 H   &#34;     &#34;          &#34;                                   
    3,6-disulphonic acid                                                  
    (2)                                                                   
100   &#34;          H                                                        
                      ##STR134##                                          
                           &#34;          &#34;                                   
101   &#34;          H   &#34;     C.sub.2 H.sub.5                                
                                      &#34;                                   
102   &#34;          H   &#34;     CH.sub.3   &#34;                                   
103 1-hydroxynaphthalene- 3-sulphonic acid (2)                            
                 H   &#34;                                                    
                            ##STR135##                                    
                                      &#34;                                   
104   &#34;          SO.sub.3 H                                               
                     &#34;     &#34;          &#34;                                   
105   &#34;          &#34;   &#34;     C.sub.2 H.sub.5                                
                                      &#34;                                   
106 2-hydroxynaphthalene- 8-sulphonic acid (1)                            
                 &#34;   &#34;                                                    
                            ##STR136##                                    
                                      &#34;                                   
107   &#34;          &#34;   &#34;     C.sub.2 H.sub.5                                
                                      &#34;                                   
108 2-hydroxynaphthalene- 8-sulphonic acid (1)                            
                 H   &#34;                                                    
                            ##STR137##                                    
                                      &#34;                                   
109 1-(4&#39;-sulfophenyl)-                                                   
                 H   &#34;     &#34;          yellow                              
    3-methyl-5-pyrazolone                                                 
    (4)                                                                   
110 1-(2&#39;,5&#39;-disulpho)-                                                   
                 H   &#34;     &#34;          &#34;                                   
    phenyl-3-methyl-5-                                                    
    pyrazolone (4)                                                        
111   &#34;          H   &#34;     C.sub.2 H.sub.5                                
                                      &#34;                                   
112   &#34;          H   &#34;     CH.sub.3   &#34;                                   
113   &#34;          H                                                        
                      ##STR138##                                          
                            ##STR139##                                    
                                      orange                              
114 1-phenyl-3-methyl-5- pyrazolone-3&#39;- sulphonic acid (4)                
                 SO.sub.3 H                                               
                      ##STR140##                                          
                           &#34;          yellow                              
115 1-phenyl-3-methyl-5-                                                  
                 &#34;   &#34;     &#34;          &#34;                                   
    aminopyrazole-4&#39;-                                                     
    sulphonic acid (4)                                                    
116 N-ethyl-N-benzyl-                                                     
                 &#34;   &#34;     &#34;          &#34;                                   
    aniline-3&#39;-                                                           
    sulphonic acid (4)                                                    
117   &#34;          &#34;   &#34;     C.sub.2 H.sub.s                                
                                      &#34;                                   
118 2-amino-8- hydroxynaphthalene- 6-sulphonic acid (1)                   
                 &#34;   &#34;                                                    
                            ##STR141##                                    
                                      red                                 
119 2-acetoacetylamino- naphthalene-5,7- disulphonic acid (CH.sub.        
                 H)                                                       
                      ##STR142##                                          
                            ##STR143##                                    
                                      orange                              
__________________________________________________________________________
 
    
     EXAMPLE 120 
     19.8 Parts of 3,8-diaminodibenzofuran are suspended in 150 parts water and 25 parts hydrochloric acid at 0° - 2°. Then a solution consisting of 14 parts sodium nitrate in 60 parts water is dropped into the suspension, keeping the temperature between 0° and 5°. 
     After 30 minutes a solution consisting of 13.7 parts para-cresidine, 100 parts acetone and 20 parts water is dropped into the tetrazo solution. After 3 hours of stirring at 0° - 5° the pH of the suspension is adjusted to 5 by adding 10 parts sodium acetate. After another hour, a solution consisting of 38.4 parts 1-hydroxynaphthalene-3,6,8-trisulphonic acid, 40 parts of a 30% aqueous sodium hydroxide solution and 100 parts water is added to the coupling mixture. The coupling mixture is stirred 4 hours, during which the temperature may rise to room temperature. The pH of the suspension is adjusted to 7, after which the precipitated product is removed by suction and washed with an aqueous sodium chloride solution. 
     Under intensive stirring a neutral solution of the aminodisazo compound obtained above is allowed to flow into 600 parts water at 0° and admixed with 18.4 parts of cyanuric chloride which have been suspended in 200 parts water and 200 parts ice. The pH of the reaction medium is kept between 3 and 4 during this by adding a 15% aqueous sodium carbonate solution. The condensation product is precipitated with sodium chloride, filtered off and purified with an aqueous sodium chloride solution. The dyestuff is dried under vacuum at 40° - 50°. In the milled state it is a brown powder, which dissolves in water to a scarlet colour. The dyestuff of the formula: ##STR144## will dye cellulosic fibres to light-, wash-, water- and perspiration-fast shades, and wool, silk and synthetic polyamide to light-, wash-, water-, perspiration-, mill- and dry-cleaning-fast scarlet tones. 
     In the Table IV that follows are the structures of further dyestuffs which can be produced according to the directions under Example 120. The correspond to the formula: ##STR145## in which the symbols R 20 , R 21 , X&#39; and R 22  represent initial compounds or radicals employed to produce the azo compounds of formula (d) which are given in the appropriate columns of the table. The colour shade produced on cellulose and polyamide is indicated in a further column I. 
     
                                           Table IV                                
__________________________________________________________________________
                                                     Colour               
                                                     shade on             
No. R.sub.20        X&#39;    R.sub.21    R.sub.22       polyamide            
__________________________________________________________________________
                                                     (I)                  
121 1-hydroxynaphthalene-3,6- disulphonic acid (2)                        
                    H                                                     
                           ##STR146## 2,4,6-trichloro-1, 3,5-triazine     
                                                     scarlet              
122    &#34;            H                                                     
                           ##STR147##    &#34;            &#34;                   
123 2-hydroxynaphthalene-6,8-                                             
                    H     &#34;              &#34;            &#34;                   
    disulphonic acid (1)                                                  
124    &#34;            H     &#34;           2,4,5,6-tetra-  &#34;                   
                                      chloropyrimidine (4)                
125    &#34;            H     &#34;           5-chloro-2,4,6-                     
                                                      &#34;                   
                                      trifluoropyrimi-                    
                                      dine (4)                            
126    &#34;            H                                                     
                           ##STR148##    &#34;            &#34;                   
127    &#34;            H                                                     
                           ##STR149## 2,4,6-trichloro- 2,3,5-triazine     
                                                      &#34;)                  
128 2-hydroxynaphthalene-                                                 
                    H     &#34;              &#34;            &#34;                   
    3,6,8-trisulphonic acid (1)                                           
129 1-phenyl-3-methyl-5-                                                  
                    H     &#34;              &#34;           goldish-             
    pyrazolone-2&#39;,5&#39;-                                yellow               
    disulphonic acid (4)                                                  
130 2-hydroxynaphthalene- 6,8-disulphonic acid (1)                        
                    H                                                     
                           ##STR150##    &#34;           red                  
131 2-hydroxynaphthalene- 6,8-disulphonic acid (1)                        
                    H                                                     
                           ##STR151## 2,4,6-trichloro-1,3,5- triazine     
                                                     goldish- yellow      
132 1-hydroxynaphthalene-                                                 
                    SO.sub.3 H                                            
                          &#34;              &#34;           red                  
    4-sulphonic acid (4)                                                  
133 2-hydroxynaphthalene-                                                 
                    &#34;     &#34;              &#34;            &#34;                   
    8-sulphonic acid (1)                                                  
134    &#34;            H                                                     
                           ##STR152##    &#34;            &#34;                   
135    &#34;            H                                                     
                           ##STR153##    &#34;           red with  bluish     
                                                     tinge                
136    &#34;            H                                                     
                           ##STR154##    &#34;           red                  
137 N-ethyl-N-benzylaniline -3&#39;-sulphonic acid (4)                        
                    H                                                     
                           ##STR155## 5-chloro-2,4,6-tri- fluoropyrimidine
                                       (4)           purple               
138 2-hydroxynaphthalene-                                                 
                    H     &#34;              &#34;           red                  
    6,8-disulphonic acid (1)                                              
139    &#34;            H     &#34;           2,4,6-trichloro-1,3,5-              
                                                     red                  
                                      triazine (2)                        
140    &#34;            H     &#34;           2-anilino-4,6- red                  
                                      dichloro-s-triazine (4)             
141    &#34;            H     &#34;           2-anilino-4,6- red                  
                                      dichloro-s-triazine-                
                                      4&#39;-sulphonic acid                   
__________________________________________________________________________
                                      (4)                                 
 
    
     EXAMPLE 142 
     19.8 Parts of 3,8-diaminodibenzofuran are suspended in 150 parts water and 25 parts hydrochloric acid at 0° - 2°. Then a solution consisting of 14 parts sodium nitrite in 60 parts water is added drop by drop to the suspension, keeping the temperature between 0° and 5°. 
     After 30 minutes a solution consisting of 30.4 parts 1-hydroxynaphthalene-3,6-disulphonic acid, 8 parts sodium carbonate and 200 parts water is added by drops to the tetrazo solution. The coupling mass is stirred 2 hours at 0° - 5°, after which it is poured into a vessel containing 13.7 parts p-cresidine, 100 parts acetone, 70 parts water and 25 parts of a 30% aqueous hydrochloric acid solution. The coupling mixture is stirred for a further hour, with the pH below 1. By adding a 25% aqueous sodium acetate solution drop by drop over 3 hours, the pH of the suspension is greatly adjusted to 4.5. 
     The pH of the suspension is adjusted to 7 with caustic soda solution, after which the precipitated product is removed by suction, washed with an aqueous sodium chloride solution and dried at 100°. The condensation of the aminodisazo compound with cyanuric chloride is effected in analogous manner to Example 120. 
     The dyestuff of the formula: ##STR156## will dye cellulosic fibres to shades fast to light, washing, water and perspiration, and wook silk and nylon to scarlet tones which stand up to light, washing, water, perspiration, milling and dry cleaning. 
     EXAMPLE 143 
     32 Parts of 3-acetylamino-8-aminodibenzofuran-7-sulphonic acid (obtained by acetylating 3,8-diaminodibenzofuran-7-sulphonic acid with acetic anhydride in aqueous medium at room temperature) are dissolved in 100 parts water and 10 parts 30% aqueous sodium hydroxide solution at room temperature. To this solution 3.5 parts sodium nitrate are added, stirring 15 minutes. The solution is then added drop by drop within 30 minutes, accompanied by stirring, into 30 parts concentrated hydrochloric acid and 150 parts water at 0° - 5°, continuing to stir the resulting diazo suspension for a further half-hour. A solution consisting of 30.4 parts 1-hydroxynaphthalene-3,6-disulphonic acid, 20 parts of a 30% aqueous sodium hydroxide solution and 200 parts water is added dropwise to the diazo suspension. The coupling mass is stirred for 2 hours at 0° - 5°. Then the resulting suspension is heated to 90°, and after adding 50 parts of a 30% aqueous hydrochloric acid it is boiled for 3 hours at 90°. The precipitated aminoazo product is filtered at 60° and washed with a 10% hydrochloric acid solution, stirred into 200 parts water and dissolved with 20 parts of 30% aqueous sodium hydroxide solution. To this solution 3 parts sodium nitrate are added, after which the nitrite-containing solution is added dropwise to 25 parts hydrochloric acid and 150 parts water at 0° - 5°, accompanied by stirring. The resulting diazo suspension is stirred for a further half-hour. 
     After this a solution containing 12 parts p-cresidine, 100 parts acetone and 70 parts water is added to the diazo suspension. By adding a 25% aqueous sodium acetate solution is drops over a period of 3 hours, the pH of the suspension is gradually adjusted to 4.5. The coupling mixture is stirred 4 hours, during which the temperature may be allowed to rise to room temperature. The pH of the suspension is adjusted to 7, the precipitated dyestuff is then removed by suction and washed with an aqueous sodium chloride solution. Condensation of the aminodisazo dyestuff obtained with cyanuric chloride is effected in analogous manner to Example 120. The dyestuff is dried under vacuum at 40° - 50°. In the milled state it is a brown powder, which dissolves in water to a scarlet colour. The dyestuff of the formula ##STR157## will dye cellulosic fibres to shades fast to light, washing, water and perspiration and wool, silk and synthetic polyamide to tones which stand up to light, washing, water, perspiration, milling and dry cleaning. 
     In the Table V that follows, the structures of further dyestuffs are given which can be produced according to the directions in Example 143. They correspond to the formula: ##STR158## in which the symbols R 23 , R 24 , X&#39; and R 25  denote the initial compounds and radicals used in the production of the azo compounds of formula (e), which are given in the appropriate columns of the table. The colour shade produced on cellulose and polyamide is indicated in a further column (I). 
     
                                           Table V                                 
__________________________________________________________________________
No. R.sub.23        X&#39;    R.sub.24    R.sub.25       I                    
__________________________________________________________________________
144 1-hydroxynaphthalene- 3,6-disulphonic acid (2)                        
                    H                                                     
                           ##STR159## 2,4,6-trichloro-1,3,5- triazine     
                                                     scarlet              
145    &#34;            H                                                     
                           ##STR160##    &#34;            &#34;                   
146 2-hydroxynaphthalene-                                                 
                    H     &#34;              &#34;            &#34;                   
    6,8-disulphonic acid (1)                                              
147    &#34;            H     &#34;           2,4,5,6-tetrachloro-                
                                                      &#34;                   
                                      pyrimidine (4)                      
148    &#34;            H     &#34;           5-chloro-2,4,6-tri-                 
                                                      &#34;                   
                                      fluoropyrimidine (4)                
149    &#34;            H                                                     
                           ##STR161##    &#34;            &#34;                   
150    &#34;            H                                                     
                           ##STR162## 2,4,6-trichloro-1,3,5- triazine     
                                                       &#34;                  
151 2-hydroxynaphthalene-                                                 
                    H     &#34;              &#34;            &#34;                   
    3,6,8-trisulphonic                                                    
    acid (1)                                                              
152 1-phenyl-3-methyl-                                                    
                    H     &#34;              &#34;           goldish-             
    5-pyrazolone-2&#39;,5&#39;-                              yellow               
    disulphonic acid (4)                                                  
153 2-hydroxynaphthalene- 6,8-disulphonic acid (1)                        
                    H                                                     
                           ##STR163##    &#34;           red                  
154    &#34;            H                                                     
                           ##STR164##    &#34;            &#34;                   
155 1-hydroxynaphthalene- 4-sulphonic acid (2)                            
                    SO.sub.3 H                                            
                           ##STR165## 2,4,6-trichloro-1,3,5- triazine     
                                                     red                  
156 2-hydroxynaphthalene-                                                 
                    &#34;     &#34;              &#34;            &#34;                   
    8-sulphonic acid (1)                                                  
157    &#34;            H                                                     
                           ##STR166##    &#34;            &#34;                   
158    &#34;            H                                                     
                           ##STR167##    &#34;           red with bluish      
                                                     tinge                
159    &#34;            H                                                     
                           ##STR168##    &#34;           red                  
160 N-ethyl-N- benzylaniline-3&#39;- sulphonic acid (4)                       
                    H                                                     
                           ##STR169## 5-chloro-2,4,6-tri- fluoropyrimidine
                                       (4)           purple               
161 2-hydroxynaphthalene-                                                 
                    H     &#34;              &#34;           red                  
    6,8-disulphonic                                                       
    acid (1)                                                              
162    &#34;            H     &#34;           Cyanuric chloride                   
                                                     red                  
163    &#34;            H     &#34;           2-anilino-4,6- red                  
                                      dichloro-S-                         
                                      triazine (4)                        
164    &#34;            H     &#34;           2-anilino-4,6- red                  
                                      dichloro-S-triazine-                
                                      4&#39;-sulphonic acid (4)               
164a                                                                      
    1-hydroxynaphthalene- 3,6-disulphonic acid (2)                        
                    SO.sub.3 H                                            
                           ##STR170## 5-chloro-2,4,6-tri- fluoropyrimidine
                                       (4)           red                  
164b                                                                      
    1-phenyl-3,-methyl pyrazolone-5-(2&#39;,5&#39;- disulphonic acid              
                    H4)                                                   
                           ##STR171## 2,4,6-trichloro-1,3, 5-triazine     
                                                     orange               
__________________________________________________________________________
 
    
     EXAMPLE 165 
     75,6 Parts of the dyestuff of Example 100 are dissolved in 1000 parts water at 60° and mixed with 30 parts sodium acetate and 115 parts of a molar copper sulphate solution. Within 3 hours 29 parts of a 40% hydrogen peroxide solution are added drop by drop at a temperature of 60° - 65°, maintaining the pH at 5.0 - 5.5 by dropping in a 30% ammonia solution. The copper complex is precipitated by adding sodium chloride, filtered off and washed with a dilute aqueous sodium chloride solution. The dyestuff of the formula: ##STR172## will dye natural and synthetic polyamides and celluloses to fast brown tones. 
     Set out in Table VI are the structures of further dyestuffs which can be produced according to the directions under Example 165. 
     
         __________________________________________________________________________
Example                                                                   
       Initial dyestuff                                                   
No.    from Example No.                                                   
                  Complex dyestuff                     I                  
__________________________________________________________________________
166    101                                                                
                   ##STR173##                          brown              
167    95                                                                 
                   ##STR174##                          brown              
168    99                                                                 
                   ##STR175##                          dark brown         
169    111                                                                
                   ##STR176##                          brown              
170    57                                                                 
                   ##STR177##                          brown              
171    56                                                                 
                   ##STR178##                          reddish brown      
172    65                                                                 
                   ##STR179##                          reddish brown      
173    74                                                                 
                   ##STR180##                          reddish            
__________________________________________________________________________
                                                       brown              
 
    
     EXAMPLE 174 
     If in Example 165, p-cresol is used as second coupling component instead of phenol, the disazo dyestuff can no longer be tosylated. It is however possible to treat the resulting disazo dyestuff under the same conditions as in Example 165, though with twice the quantity of sodium acetate, copper sulphate and hydrogen peroxide. The dyestuff obtained with the formula: ##STR181## will dye polyamide and cellulose fibers to navy blue shades. 
     The following examples can be produced in similar manner to that described under Example 165. 
     EXAMPLE 175 ##STR182## 
     EXAMPLE 176 ##STR183## 
     EXAMPLE 177 ##STR184## 
     EXAMPLE 178 ##STR185## 
     EXAMPLE 179 ##STR186## 
     APPLICATION 
     The compounds of formula I specifically exemplified above may dye various substrates using methods conventional in themselves and appropriate to the particular dyestuff and substrate. Thus, for example, dyeing with metal-containing dyestuffs may be carried out in similar ways to that described in French Pat. No. 1,570,531, dyeing with anionic dyestuffs in similar ways to that described in Belgian Pat. No. 732,845, dyeing with reactive dyestuffs in similar ways to that described in French Pat. No. 1,420,687, and the dyeing of leather in ways similar to those described in Belgian Pat. No. 745,821.