Bis-methine compounds
United States Patent 1191 Weaver 1 Apr. 22, 1975 [5 BIS-METHINE COMPOUNDS 3.504.010 3/1970 Straley etal 260/465 [75] Inventor: Max Arweaver, Kmgsport. Tenn. &#39;w Examiner LewiS Gous [73] Assignee: Eastman Kodak Company, Assistant E.\&#39;aminer-Dolph H. Torrence Rochester, NJY. V 122 Filed: Nov. 23, 1-970 7 ABSTRACT 1 Compounds having two cyanomethylideneaniline moi- [211 App! 92268 &#39;eties linked together through the aniline nitrogen atom Related [15. Application Data of each by a &#39;grouphaving the formula [62] Division of Scr. No. 675.799, Oct. I7, 1967, Pat. No. I I  
  3.597.434. i v Q Q R -&#39;-X-i--R -i)X-R [52] US. Cl 260/465 D; 8/542; 8/178 R; 1  
  8/179; 260/287 R v 511 1m. 61. c071; 121/70 wherein R2 and each is alkylene, X is oxygen or [58] Field of Search... 260/465 D tween and Riis alkylene which can be interrupted y r an oxygen, s&#39;ulfur or nitrogen&#39;atom, vinylene, ethyny 5 mit lene, cycloalkylene, cycloalkyldialkylene; arylene or UNTED STATES PATENTS naphthylen e are useful as dyes for hydrophobic textile 3.386.491 6/1968 Weaver 260/465 materials Such as i&#39; fibers 3,435.062 3/1969 10 Claims, No Drawings Marrable 260/465 1 BlS-METHINE COMPOUNDS This is a division of our US. application Ser. No. 675,799, filed Oct. 17, 1967, now US. Pat. No. 3,597,434.  
  This invention relates to certain novel methine compounds and, more particularly, to bis-methine compounds which are useful as dyes for hydrophobic textile materials.  
  The bis-methine compounds of the invention are characterized by the general formula n o o R5 wherein R and R individually are the same or different and each represents a p-phenylene group; R and R individually are the same or different and each represents a lower alkyl group, a cycloalkyl group or a phenyl group;  
 where R is hydrogen or lower alkyl; and  
  Y represents cyano, lower alkoxycarbonyl, carbamoyl, N-lower alkylcarbamoyl, N,N-di-lower alkylcarbarnoyl, lower alkylsulfonyl, or a phenylsulfonyl group. The bis-methine compounds of the invention give yellow dyeings having excellent fastness when applied 2 phenylene, 3-methyl-4-phenylene 3-chloro-4- phenylene, 3-bromo-4 phenylene, 3-methoxy-4- phenylene, Z-methoxy-S-chloro-4-phenylene, 3-ethyl- 4-phenylene, 2,5-dimethoxy-4-phenylene, etc. The designation of the position of the substituents of the pphenylene groups represented by R and R is made with reference to the aniline intermediates, i.e., the anilino nitrogen atom is at the 1 position. A preferred group of the p-phenylene groups represented by R and R have the formula wherein Z represents hydrogen, lower alkyl, e.g. methyl, ethyl, butyl; lower alkoxy, e.g. methoxy, ethoxy, propoxy, butoxy; or halogen, e.g. chloro, bromo; and n represents 1 or 2. When n is 2, Z can be the same or different.  
  The alkyl groups which R and R can represent can be straight or branch chain, unsubstituted or substituted lower alkyl. As used herein to describe a substituent, lower refers to an alkyl moiety having up to about 4 carbon atoms. Typical alkyl groups represented by R are methyl, ethyl, propyl, isopropyl, butyl,  
 hydroxyalkyl, e.g. B-hydroxyethyl, 2,3-dihydroxypropyl; lower alkoxyalkyl, e.g. B-methoxyethyl; cyanoalkyl, e.g. B-cyanoethyl; cyanoalkoxyalkyl, e.g. B-cyanoethoxyethyl; lower alkanoyloxyalkyl, e.g. B-acetoxyethyl; lower alkoxycarbonylalkyl, e.g. B-ethoxycarbonylethyl; haloalkyl, e.g. B-chloroethyl, gammachloropropyl, B-bromethyl; hydroxyhalogenoalkyl, e.g. gamma-chloro-B-hydroxypropyl; lower alkanoylaminoalkyl, e.g. B-acetamidoethyl; carbamoylalkyl, e.g. B-carbamoylethyl; N-lower alkylcarbamoylalto hydrophobic textile fibers, yarns and fabrics by conventional means. Cellulose acetate, polyamide, modacrylic and polyester fibers are illustrative of the hydrophobic textile materials which can be dyed with the compounds of the invention. The compounds are water insoluble and therefore can be applied to hydrophobic textile materials by methods well known in the art of disperse dyes. Coloration of such textile materials can also be effected by incorporating the novel compounds into the dope or melt prior to spinning and then spinning the fiber as usual. The compounds of the invention exhibit exceptionally good fastness to sublimation on polyester fibers.  
  The p-phenylene groups which R and R can represent can be substituted or unsubstituted. Typical of the p-phenylene groups represented by R and R are pkyl, e.g. B-N-methylcarbamoylethyl; N-phenylcarbamoyloxyalkyl, e.g. ,B N-phenylcarbamoylethyl; lower alkylsulfonylalkyl, e.g. B-methylsulfonylethyl; arylalkyl, e.g. benzyl; phenoxyalkyl, e.g. B-phenoxyethyl; lower alkylsulfonamidoalkyl, e.g. methylsulfonamidoethyl; N-phenylcarbamoyloxyalkyl; lower dicarboximidoalkyl, e.g. succinimidoethyl, etc. Although the alkyl groups represented by R and R are characterized as lower alkyl, when the alkyl group is substituted by a carbon containing substituent, e.g. alkoxy, the preferred substituted alkyl group can contain up to about 8 carbon atoms, e.g. delta-butoxybutyl.  
  The phenyl groups that R and R can represent include, for example, phenyl and phenyl substituted with lower alkyl, lower alkoxy, nitro, halogen, etc. Illustrative of such groups are phenyl, p-tolyl, m-nitrophenyl, o,p-dichlorophenyl, and p-anisyl. Cyclohexyl is typical of the cycloalkyl groups which R and R can represent.  
 The l,2,3,4-tetrahydroquinoline group which R and R, and R and R, together with their common nitrogen atom, can represent can be unsubstituted or substituted. The tetrahydroquinoline groups are attached to the cyanomethylidene groups at the 6 position and to the substituents R and R at the 1 position as is indicated by formula (1). Examples of the various substituents which can be present on the tetrahydroquinoline group include alkyl, alkoxy, halogen, dialkylamino, phenyl, alkanoyloxy, halogen, alkylsulfonamido, and  
 alkanoylamino. A preferred group of tetrahydroquinolines which 1 R-E- and. -N-R6 can collectively represent have the formula wherein Q, Q, and Q are the same or different and each represents hydrogen or lower alkyl;  
 Q represents hydrogen, lower alkyl, lower alkoxy,  
 halogen, hydroxy, or lower alkanoyloxy;  
 Q represents hydrogen, lower alkyl, lower alkoxy, halogen, or, when Q represents hydrogen or alkyl, phenyl;  
 Q represents hydrogen, lower alkyl, lower alkoxy,  
  The phenylene groups represented by R can be 0, m, or p phenylene which can be unsubstituted or substituted, for example, with lower alkyl, lower alkoxy, halogen, nitro, cyano, lower alkanoylamino, lower alkylsulfonamido, lower alkanoyloxy, etc. The groups described above relative to the definition of R and the ortho and meta analogs thereof are typical of the phenylene groups represented by R&#34;. Cyclohexylene, including 1,4-, 1,3-, and l,2-cyclohexylene are representative of the cycloalkylene groups which R can represent. Typical cyclohexylenedialkylene groups that R can represent include l,4-cyclohexylenedimethylene, 1,3- cyclohexylenedimethylene, and 1,2- cyclohexylenedimethylene. 1,4-naphthylene, 1,2- naphthylene, and 1,8-naphthylene are illustrative of the naphthylene groups represented by R&#39;&#34;. Such naphthylene groups also include naphthylene substituted, for example, with the groups that can be present on the substituted phenylene groups represented by R Typical lower alkoxycarbonyl groups represented by Y include methoxycarbonyl, ethoxycarbonyl, propoxycarbonyl, isopropoxycarbonyl, butoxycarbonyl, etc. Examples of the lower alkylsulfonyl groups which Y halogen, lower alkanoylamino, lower alkylsulfoncan represent are methylsulfonyl, ethylsulfonyl, propylamldo, lower dlalkylamino, or; when Q4 represents sulfonyl, butylsulfonyl, etc. The phenyl group of the hydrogen or alkyl, p y phenylsulfonyl groups which Y can represent can be 06 represents hydrogen, lower alkyl, lower alkoxy, unsubstituted or substituted, for example, with lower halogenalkyl, lower alkoxy, halogen, etc. Examples of the sub- The alkylene groups represented y R3, and R4 stituted phenylsulfonyl groups which Y can be are pcan be straight or branched chain, unsubstituted or t l l lf l i l lf l hl h l lf l substituted lower alkylene. Examples of the alkylene b h l lf l etc. Typical lower alkyl Subs? groups represented y R2 are ethylene, P py tuted carbamoyl groups are N-methylcarbamoyl, N- propylene, n-butylene, isobutylene, haloalkylene, e.g. ethylcarbamoyl Nmrowlcarbamw], p py p py r ehlomethy&#39; butylcarbamoyl, N,N-dimethylcarbamoyl, N,N-diethyllene, hydroxyalkylene, e.g. 2-hydroxypropylene, hycarbamoyl, NNdiProPwal-bamwl, etc droxyethylene lower alkanoyloxyalkylene Particularly preferred compounds of the invention z&#39;acetoxypropylene&#39; have the general formulas R1 1 1 1 NC &#39;o R R l-. CN C =HC&#39; &#39;fl lR -X R -XR l I o-cH=c c&#39; NC O: N  
  The alkylene groups represented by R in which an oxygen, sulfur, or nitrogen atom is present can contain up &#39;to about 6 carbon atoms. These groups have the general formula R AR wherein R and R are the same or different and each represents straightor branch-chain alkylene having up to about 3 carbon atoms and A represents oxygen, sulfur, sulfonyl or -NR wherein R is hydrogen or lower alkyl. Examples of such alkylene groups include -Cl-l SCH etc.  
 and  
 wherein R and R are lower alkyl; R and R are lower alkylene, especially ethylene;  
 or halo- As is well known in the art, the color of the compounds of the invention is attributable to the conjugated system of the cyanomethylidenephenylamino and the cyanomethylidenetrahydroquinoline moieties of the novel compounds. Thus the substituents present on the groups represented by R, R, R R, R&#34;, R and R and the group represented by Y, as these substituents and groups are defined above, do not materially affect the primary usefulness of the compounds, i.e., the ability of the compounds to dye hydrophobic fibers. As can be seen from the subsequent examples, the substituents mentioned above function primarily as auxochrome groups to control the shade of the compounds of the invention.  
  The bis-methine compounds of the invention are prepared by reacting an aminoalkyl compound or hydroxyalkyl compound represented by the formulae i R5 (II) H-R-N-RE-XH and. (III) a -xm -li-s -a with a dicarboxylic acid, or lower alkyl ester thereof, having the formula (Iv) Hoj-R ci-oa wherein R, R R R R R R and X are defined above. Thus, to prepare a symmetrical bis-methine compound, i.e., where R, R and R are the same as R, R and R the compounds of formulae (II) and (III) are the same and 2 moles of the aminoalk&#39;yl or hydroxyalkyl compound is reacted with 1 mole of an acid of formula (1V) to yield the intermediate compound (V):  
 The reaction is carried out in the presence or absence of solvents and with the use of a catalyst such as sulfuric acid, p-toluenesulfonic acid, tetraisopropyltitanate,  
 etc.  
  The intermediate compound (V) is then formylated (e.g., by treating with POCl and dimethylformamide) and the formylated product is reacted with an active methylene compound, e.g. malononitrile, to yield the novel bis-methine compound of formula (1).  
  To prepare the unsymmetrical compounds of the invention, the procedure is essentially the same except that 1 mole of a compound of formula (11) is reacted with a dicarboxylic acid anhydride having the formula and the product obtained is reacted with a compound of formula (lll), where the compounds of formulas (I1) and (III) are different. The intermediate is then formylated and reacted with an active methylene compound as described above to yield the bis-methine compound of formula (1).  
  The intermediates useful in preparing the compounds of the invention are commercially available or can be prepared by known procedures.  
  Representative compounds corresponding to formulae (11) and (Ill) include N-ethyl-N-B-hydroxyethyl-mtoluidine, N-ethyl-N-B-hydroxyethylaniline, N-2- aminoethyl-N-ethyl-m-toluidine, N-n-butyl-N-B- hydroxyethyl-m-anisidine, N-chloroethyl-N-B- hydroxyethyl-m-chloroaniline, N-methoxyethyl-N-B- hydroxyethyl-m-chloroaniline, N-cyanoethyl-N-B- hydroxyethylaniline, N-acetamidoethyl-N-B- hydroxyethylaniline, N-phenoxyethyl-N-fl-hydroxyethyl-m-toluidine, N-B-hydroxyethyl-N-ethoxycarbonylm-anisidine, N-carbonamidoethyl-N-2- aminoethylaniline, N-cyanoethoxyethyl-N-2-aminoethyl-m-anisidine, N-benzyl-N-Z-aminoethyl-m-toluidine,.  
 N-phenyl-N-2-aminoethylaniline, N-succinimidoethyl- N-Z-aminoethylaniline, etc. Where R and R, together with their common nitrogen atom, form a heterocyclic group, representative compounds are 1-(2- hydroxyethyl)-2,2,4,7-tetramethyl-1,2,3 ,4- tetrahydroquinoline, 1-( 2-hydroxyethyl 1 ,2,3 ,4- tetrahydroquinoline, l-( 2-hydroxyethyl)-2,2,4,7- tetraethyl-1,2,3 ,4-tetrahydroquinoline, 1- (Zaminoethyl)-2,2,4-trimethyl-7-methoxy-1,2,3 ,4- tetrahydroquinoline, 1-(2-aminoethyl)-2,2,4-trimethyl- 7-chlorol ,2,3,4-tetrahydroquinoline, 1-(2- hydroxyethyl)-2,2,4-trimethyl-7-ethoxy-1,2,3,4- tetrahydroquinoline, etc.  
  Representative compounds corresponding to formula (IV) include diethyl succinate, dimethyl glutarate, dimethyl maleate, dimethyl isophthalate, dimethyl terephthalate, dimethyl phthalate, cyclohexanedicarboxylic acid, etc.  
 Typical active methylene compounds utilized in pre-- paring the novel bis-methine compounds of the invention are malononitrile, methylsulfonylacetonitrile, methylcyanoacetate, phenylsulfonylacetonitrile, cyanoacetamide, etc.  
  The following examples further illustrate the preparation of representative intermediates and bis-methine compounds of the invention.  
 EXAMPLE 1 a. Preparation of bis[2-(N-ethyl-m-toluidino)ethyl]- succinate An amount of 34.8 g. diethyl succinate, 71.6 g. N- ethyl-N-B-hydroxyethyl-m-toluidine and 5 drops of titanium tetraisopropoxide are stirred and refluxed together for 3 hr., allowing ethanol to be removed. The reflux temperature rose from 170C. to 210C. during this period, and about 90% of the theoretical amount of ethanol is collected. The product is allowed to cool and a portion is converted into the bis-aldehyde. b. Preparation of bis[2-(N-ethyl-4-formyl-mtoluidino)ethyl]succinate An amount of 22.0 g. of bis[2-(N-ethyl-m toluidino)ethyl]succinate is dissolved by stirring in 20 ml. of drydimethylformamide. The solution is cooled and 10 m1. of phosphorus oxychloride added below 30C. After heating 1 hr. on the steam bath, the reaction is drowned on an ice-water mixture. This mixture is then made basic with 50% NaOH, resulting in an oily product. The aqueous portion is decanted off and the bis-aldehyde taken up by heating with ml. of ethanol. On cooling, the product crystallizes and is collected by filtration, washed with ethanol and air dried. The product melts at 8590C. and one recrystallization from ethanol gives the pure bis-aldehyde melting at 95-97C.  
 c. Preparation of Bis-methine dye An amount of 4.97 g. bis[2-(N-ethyl-4-formyl-mtoluidino)ethyl] succinate, 1.32 g. malononitrile, 100 ml. ethanol and drops of piperidine are heated together on steam bath for 30 minutes. The product crystallizes on cooling and is collected by filtration. The crude product is heated to boiling in 100 ml. of ethanol, allowed to cool to about 50C., filtered, washed with ethanol, and air dried. The yellow dye obtained melts at l52157C. and dyes polyester fibers yellow shades of outstanding light and sublimation fastness. The dye has the following structure:  
 - c H NC C2H5 O O l 5 \CJIC I c H occn ca lioc n N Nc/ 2 2 2 2 1+ EXAMPLE 2 a. Preparation of Bis[2-(N-ethyl-m-toluidino)ethyl- 30 ]isophthalate An amount of 179 g. N-ethyl-N-B-hydroxyethyl-mtoluidine, 97 g. dimethylisophthalate, and drops titanium tetraisopropoxide are refluxed together for 2 hr.,  
 allowing the methanol to be removed. The reflux temperature rose from 160C. to 200C. during this period. The mixture is then transferred to a distillation flask and low boiling material is removed (-35 g.) until the pot temperature reaches 200C. at 0.8 mm. Hg. The  
 product remaining in the flask weighs 213 g., and is a 55 very heavy, viscous liquid. b. Preparation of Bis[ 2-( N-ethyl-4-formyl-mtoluidino)ethyl]isophthalate An amount of 48.8 g. of bis[2-(N-ethyl-mtoluidino)ethyl]isophthalate is dissolved in 50 ml. of dry dimethylformamide. The solution is cooled and ml. POCl added below C. After heating 1 /2 hr. on  
 the steam bath the reaction is drowned slowly with good stirring into 1 liter of watercontaining 35 ml. of NaOH and enough ice to keep the mixture at about room temperature. A sticky product results which is washed once by decantation and then taken up 10 in 500 ml. of hot ethanol. On standing at room temperature for several days, the product crystallizes and is collected by filtration, washed with ethanol and air dried; m.p. 8992C. Elemental analysis (theoretical C 70.5, H 6.7, N 5.1;  
 15 found: C 70.5, H 7.0, N 5.2).  
 0. Preparation of Bis-methine dyes An amount of 2.74 g.bis[2-(N-ethyl-4-formyl-mtoluidino)ethyl] isophthalate, 0.66 g. malononitrile, 3  
 drops piperidine, and 15 ml. methyl Cellosolve are heated together at C. for 1 hr. The reaction is allowed to cool and the product collected by filtration, washed with ethanol, and air dried. The yellow dye melts at 158l61C. and dyes polyester fibers yellow shades having excellent light and sublimation fastness.  
 The structure of this dye is:  
  An amount of 1.3 g. bis[2-(N-ethyl-4-formyl-mtoluidino)ethyl] isophthalate, prepared according to Example 2(b), above, 0.60 g. methylsulfonylacetonitrile,3-drops of piperidine, and 25 ml. ethanol are refluxed together for 2 hr. After allowing to stand overnight at room temperature, the product is filtered, washed with ethanol, and air dried. The yellow dye has the following structure:  
  2 5 o N-CgHhOll c n l )T&#39; coc a n 9 10 EXAMPLE 4 An amount of 23.0 g. bis[2-(N-ethylanilino)ethyl- I ]1sophthalate is dissolved in ml. of dry dimethyl- An amount of 1.36 g. b1s[2-(N-ethyl-4-formyl-mformamide. The solution is cooled and 10 ml. of phostoluidino)ethyl] isophthalate and 0.50 g. methylcyanphorus oxychloride are added below C. After heato acetate are reacted together using the same condi- 5 ing for 1 hr. at 95C., the reaction is drowned into an trons of Example 3, to yield the following yellow dye: ice-water mixture. This is made basic with NaOH (IJIOC HuN CH==C CH3 I 0. EXAMPLE 5 and the sticky product is washed by decantation. The  
 I product is taken up in 200 ml. ethanol and allowed to f Iamoum l hy y stand overnight. The bis-aldehyde crystallizes and is m k y l lsqphthalate&#39; and Phenylsul- 2O collected by filtration and dried. Recrystallization from fonylacetomtrile are reacted together as in Example 3, ethanol gives the pure aldehyde melting at to yield the following yellow dye: lO2l04C.  
  NC 5 fi- C=HC N---C HJ+OC I I II a 2 r CH s&#34;: 000 N --&#39;-CH=C 4 n Q 80 G I o 3 I EXAMPLE 6 i c. Preparation of Bis-methine dye I An I amount of I 2.58 g. bis[2-(N-ethyl-4- of l y Q y formylanilino)ethyl]isophthalate, 0.66 g. malononitoluldmokthyll lsophthalate and trile, 3 drops piperidine, and 25 ml. ethanol are recyanoacetamide are reacted as in Example 3 m Yield 35 fluxed together for 1 hr. The reaction is allowed to cool the following yellow dye: and the product is collected by filtration, washed with -NC 5 II C=HC N-C l&#39;l OC I I i -C r C H A I I If CH C I 1, 1 00 H I I 7.; O I 2) EXAMPLE 7 &#39;methanol, and air dried. The dye melts at 171l76C.  
  and dyes polyester fibers bright, greenish yellow shades 50 possessing excellent light and sublimation fastness. It  
 a. Preparation of Bis[2-(N-ethylanilino)ethyl]is0phhas the following structure:  
 thalate An amount of 82.5 g. N-ethyl-N-B- EXAMPLE 8 hydroxyethylaniline, 48.5 g. dimethylisophthalate, and a. Preparation of bis[2-(N-ethyl-m-toluidino)ethyl- 5 drops titanium tetraisopropoxide are heated together lisophthalamide at reflux 2 hrs. The temperature rose from C. to An amount of 7l.2 &#39;g. N- 2-aminoethyl-N-ethyl-m- 215C. during this period as methanol was removed. 65 toluidine and 38.8 g. dimethylisophthalate are refluxed The product, which is a viscous liquid, is allowed to together for 2&#39; hr. During this time methanol is recool and is used to prepare the bis-aldehyde. moved, and the temperature rose from C. to b. Preparation of bis[2-(N-ethyl-4-formylanilino)ethyl- 250C. The reaction mixture is allowed to cool to lisophthalate I -165C. and poured gradually with stirring into 400 ml. ethanol. The solution is cooled to about C. and the crystalline product is collected by filtration and air dried. The crude material is recrystallized from 400 ml. of ethanol, filtered, and air dried to give the pure product melting at l54l56C. b. Preparation of Bis[2-(N-ethyl-4-formyl-mtoluidino)ethyl]isophthalamide Y An amount of 4.86 g. bis[2-(N-ethyl-m-toluidino)ethyl]isophthalamide is stirred with ml. dry dimethylformamide. To this slurry is added 2 ml. phosphorus oxychloride at about C. The reaction mixture is heated 1 hr. on the steam bath, drowned on ice-water, made basic with 50% NaOH, and the product is washed by decantation. The sticky product is recrystallizedfrom ethanol, filtered, and air dried; m.p. l00-lO5C. c. Preparation of Bis-methine dye An amount of 2.70 g. bis[2-(N-ethyl-4-formyl-mtoluidino)ethyl]-isophthalamide, 0.66 g. malononitrile, 3 drops piperidine, and ml. ethanol are refluxed together for 2 hr. The product crystallizes on standing at room temperature for about 2 days, and is collected by filtration, washed with ethanol, and air dried; m.p.  
 yellow shades and has the following structure:  
 EXAMPLE 9 a. Preparation of Bis[2-(l,2,3,4-tetrahydro-2,2,4,7- tetramethyll -quinolyl )ethyl]isophthalate phthalate, and 5 drops of titanium tetraisopropoxide are refluxed together for 3 hr. During this time methano] is removed and the temperature rose from 135C. to 185C. This product is used to prepare the bisaldehyde. b. Preparation of Bis[2-(6-formyl-l,2,3,4-tetrahydro- 2,2,4,7-tetramethyl-1-quinolyl)ethyl]isophthalate An amount of 29.8 g. bis[2-( l,2,3,4-tetrahydro- 2,2,4,7-tetramethyll -quinolyl)ethyl]isophthalate is treated with 20 ml. dry dimethyl formamide and 10 ml. POCl as illustrated in the preceding examples. The product, after drowning on ice-water mixture and basifying, gives a sticky aldehyde, which does not crystallize. 0. Preparation of Bis-methine compound An amount of 2.18 g. bis[2-(6-formyl-l,2,3,4 tetrahydro-2,2,4,7-tetramethyll -quinolyl )ethyl isophthalate, 0.44 g. malononitrile, 3 drops piperidine, and m1. ethanol are refluxed together for 1 hr. The reaction mixture is allowed to cool, and the product is collected by filtration, washed with ethanol, and air dried. The dye gives beautiful yellow dyeings on polyester fibers having good light and sublimation fastness. It has the following structure:  
 R ll  
 An amount of gy y y The compounds of Table 1 give yellow dyeings of extetramet hyl-l,2,3,4-tetrahydroquinoline, dimethyl isocellent fastness properties on polyester fibers.  
  The compounds set forth in the examples of Table 2 The compounds of the examples in Table 3 are preare prepared according to the procedure of Examples 15 pared according to the procedure described in Examl-9 and correspond to the general formula: ples 1-9 and correspond to the general formula:  
 The compounds give yellow dyeings of excellent fast- The compounds impart yellow shades to, and display ness properties on polyester fibers.  
 excellent fastness properties on, polyester fibers.  
 Table 2 Sub st ituents Sub stituents Sub stituents Sub stituents Ex lo No. on Ring B on Rig A i 1 c on R1 c on Ring 1) g 5 None None -CH2CH2- -0- 0 None None 471 +9 2-CH3 None -(H2CH2 -o- 2-cn None -CN 50 None 7-01-1 -&#39;CH2CH2- -o- Q None 7-611 -CN :51 2r-cH 7-c1-r -cn c1r -NH- -CH2CH2- 2- cn 7-CH3 -CN 52 2,2,h-tri-cir None cn cn -o- -CH2CH2- 2, 2,h-tri-CH None -cooca 53 2,2, +-tri-cir 7-cn -c.q ca --o- Cli Cl-l- 2,2,h-tri-CH 7-cn -CONH2 .5 2-ca 7-00 ma es -o- -CH2CH2- 2-cH 7-00 -CN 55 z-ca 7-c1 -CHgCH -o- .-cn cn 2-cn 7-01 -CN The compounds of the invention can be used for dyeing hydrophobic fibers such as linear polyester, cellulose ester, polyamide, etc., fibers in the manner described in U.S. Pat. Nos. 2,880,050, 2,782,187, 2,757,064, and 3,043,827. The following example illustrates a method by which the compounds of the invention can be used to dye hydrophobic textile materials.  
 EXAMPLE 76 An amount of 0.1 g. of the dye isdissolved in the dye pot by warming in cc. of ethylene glycol monomethyl ether. A 2% sodium-N-methyl-N-oleyl taurate and 0.5% sodium lignin sulfonate aqueous solution is added, with stirring, until a fine emulsion&#39;is obtained. Water is then slowly added to a total volume of 200 cc. Then, 3 cc. of Tanavol (an anionic solvent carrier; Tanatex Chemical Corp.) are added and grams of a textile fabric made of poly(ethylene terephthalate) polyester fibers are entered. The fabric is worked 10 minutes without heat and then for 10 minutes at 80C. The dye bath is then brought to the boil andheld at the boil for 1 hour. Following this, the fabric is rinsed in warm water, then scoured in aqueous 0.2% soap, 0.2% soda ash solution. After scouring, the fabric is rinsed with water and dried. When the compounds are used to dye polyamide textile materials, the above .described procedure can be employed except the Tanavol dyeing assistant need not be used. In applying the compounds of the invention to cellulose acetate fibers, the above procedure can be employed, omitting the Tanavol and carrying out the dyeing at 80C.  
  Polymeric linear polyester materials of the terephthalate type are illustrative of the linear aromatic polyester textile materials that can be dyed with the new compounds of our invention. Examples of such linear polyester materials are those prepared from ethylene glycol and dimethylterephthalateand those pre-.  
 pared from l,4-cyclohexanedimethanol and dimethylterephthalate. Polyester textile materials prepared from l,4-cyclohexanedimethanol and dimethylterephthalate are more particularly described in U.S. Pat. No. 2,901,446. Poly(ethylene terephthalate) fibers are described, for example, in U.S. Pat. No. 2,465,319. The polymeric linear polyester materials disclosed in U.S. Pat. Nos. 2,945,010, 2,957,745, and 2,989,363, for example, can be dyed. The linear aromatic polyester materials specifically named havev a melting point of at least 200C.  
  The invention has been described in considerable detail with particular reference to certain preferred embodiments thereof, but it will be understood that variations and modifications can be effected within the spirit and scope of the invention as described above and as defined in the appended claims.  
 We claim: 1 l l. A compound having the formula wherein R and R each is lower alkyl; lower alkyl substituted with lower alkoxy or phenyl; or cyclohexyl;  
  19 I I 20 R and R each is lower alkylene; wherein R is lower alkylene; vinylene;cyclohexylene; cycloh- R&#34; represents hydrogen, lower alkyl, lower alkoxy,  
 exylene-di-lower-alkylene; phenylene; phenylene chlorine, or bromine;  
 substituted with lower alkyl, lower alkoxy, chlorine, bromine or halogen; or a grouphaving the formula --R AR wherein R and R each is al- R represents hydrogen, lower alkyl, lower alkoxy,  
 chlorine or bromine;  
  kylene of l to 3 carbon ,atoms and A represents ox- 1 and 5 r ygen, sulfur, sulfonyl, or -NR wherein R is hyepresent lower alkyl drogen or lower alkyl; R and R represent lower alkylene; X 1s -O or NH; X represents -O-; and Y is cyano, lower alkoxycarbonyl, carbamoyl, lower alkylsulfonyl or phenylsulfonyl; R represents lower alkylene or 0-, meach Z is hydrogen, lower alkyl, lower alkoxy, chlophenylene.  
  rine or bromine; and n is l or 2. l5 A Compound according to claim 4 wherein R rep- 2. A compound according to claim 1 having the forresents hydrogen or lower y nd R represents hymula drogen.  
 N fz s O O fz s 7 CN C==CH N- CH CH OC(CH COCH CH 1\l CH=C NC CN CH3 CH3 3 A Compound according to Claim 1 wherein 3 6. A compound according to claim 1 having the forresents lower alkylene, vinylene, cyclohexylene, phenmula C H O O C H l H CN /C=HC N-CzH4-O-C-CgH4-C-O-CgH4-N g NC CN CH3 ylene, or phenylene substituted with lower alkyl, lower 7&#39;. A compound according to claim 1 having the foralkoxy, or halogen; and Y represents cyano. l  
 NC\c &#39;fz s ii I =HC N-C HA OC NC (FZHS c OC2H4N CH:  
  4. A compound according to claim 1 having the for- 8. A compound according to claim 1 having the formula 5O mula 7 E11 1 g 5 1 N R R CN s 4 =HC- l l-R -X8R @-Xr-R l l0 u-cH-o NC :0 N  
 a E ii C=HC N-C2H4OC NC CgHg CN CH fiOC H N c-n=&#39;c