0-6(7)-Methoxy-quinoxalinyl(2)-(thiono)phosphoric (phosphonic) acid esters and ester amides
United States Patent Schmidt et al.  
 06 7 )-METHOXY-QUINOXALINYL( 2 (THIONO)PHOSPHORIC (PHOSPHONIC) ACID ESTERS AND ESTER AMIDES Inventors: Karl-Julius Schmidt,  
 Wuppertal-Vohwinkel; Ingeborg Hammann, Cologne; Bernhard Homeyer, Opladen, all of Germany Bayer Aktiengesellschaft, Leverkusen, Germany Filed: Aug. 28, 1972 Appl. No.: 284,324  
 Assignee:  
 Foreign Application Priority Data Sept. 4, 1971 Germany 214439! U.S. Cl. 260/250 QP; 71/92; 424/250 Int. Cl C07d 51/78 Field of Search 260/250 Q References Cited UNITED STATES PATENTS 4/l962 Sasse 260/250 4/l970 Miller et al. 260/250 R ll/l97l Miller 260/250 R 7/l972 Gagnaux 260/250 R FORElGN PATENTS OR APPLlCATlONS 6/l963 United lsingdom 260/250 R [451 Apr. 15, 1975 l,08l,249 8/1967 United Kingdom 260/250 R 702,672 8/1967 Belgium 260/250 Primary Examiner-Donald G. Daus Assistant ExaminerRalph D. McCloud Attorney, Agent, or FirmBurgess, Dinklage &amp; Sprung [57] ABSTRACT 0-6(7)-methoxy-quinoxalinyl(2)-(thiono)phosphoric(- phosphonic) acid esters and ester amides of the formula:  
  I O-P n (I) CH O 7 I Claims, No Drawings -6(7)-METHYOXY-QUINOXALINYL(2)- (THIONO)PHOSPHORIC (PHOSPHONIC) ACID ESTERS AND ESTER AMIDES The present invention relates to and has for its objects the provision of particular new 0-6(7)-methoxyquinoxalinyl( 2 H thiono )phosphoric( phosphonic) acid esters and ester amides. which possess insecticidal. acaricidal and fungicidal properties. active compositions in the form of mixtures of such compounds with solid and liquid dispersible carrier vehicles. and methods for producing such compounds and for using such compounds in a new way especially for combating pests, e.g. insects. acarids and fungi. with other and further objects becoming apparent from a study of the within specification and accompanying examples.  
  It has been disclosed in Belgian Patent Specification No. 702.672 that alkyl-substituted and nitrosubstituted quinoxalyl( thiono )phosphoric( phosphonic) acid esters. such as 0.0-diethyl-0-(6-nitro- (Compound A) or 5.7-dimethyl-quinoxalyl(2))- thionophosphoric acid ester (Compound B) and 0- ethyl-O-(S- or 6-methylquinoxalyl(2))-ethanethionophosphonic acid ester (Compound C). display insecticidal and acaricidal properties.  
  The present invention provides. as new compounds the quinoxalyl-(thiono)phosphoric(phosphonic) acid esters and ester amides of the formula in which R is alkoxy with up to carbon atoms or di-lower alkylamino.  
 R&#34; is alkyl or alkoxy with up to 6 carbon atoms. phenyl or di-lower alkylamino.  
 the CH O radical is in the 6- or 7-position. and  
 X is oxygen or sulfur.  
  R is preferably straight-chain or branched alkoxy with l to 8 carbon atoms. dimethylamino or diethylamino; and R&#34; is preferably phenyl, dimethylamino. diethylamino or a straight-chain or branched lower alkyl or alkoxy radical with l to 4 carbon atoms.  
 &#39; 0 OH 0 0-?(0 II agent E 5 2 (C H O) PCl WCHBO I (IIIa) (Ila) N OH 01110 3 in which cides. This demand results from the fact that commercially available agents have to meet increasingly demanding requirements with regard to matters of protection of the environment, which can go as far as to lead to the prohibition of certain agents. Such requirements are. for example, low toxicity to warm-blooded animals. low phytotoxicity. rapid degradation in and on the plant in order to allow short waiting periods. and activity against&#39;resistant pests. The compounds according to the invention thus represent a genuine enrichment of the art.  
  The present invention also provides a process for the preparation of a methoxy-substituted quinoxalyl- (thiono)phosphoric(phosphonic) acid ester or ester amide of the formula (I). in which a 2- hydroxyquinoxaline derivative of the formula:  
 3O phoric(phosphonic) acid ester halide. ester amide halide or amide halide of the formula:  
  P-Hal R&#34; 40 in which ethylphosphoric acid ester chloride are used as the starting materials, the course of the reaction can be represented by the following equation:  
 Ac idb indiug The 2-hydroxy-6- or -7-methoxyquinoxaline of the formula (ll) required as the starting material can be prepared as follows: 5-methoxy-o-phenylenediamine is either reacted with glyoxyl ester semi-acetal or treated with chloroacetic acid in the presence, of a base and subsequently oxidized. A mixture of the isomers 2- hydroxy-o-methoxy-quinoxaline and 2-hydroxy-7- quinoxaline is thus obtained:  
 CH 2 co 0 H NH 2 OC2H5 CH OQ N,N-dimethyl-O-methyl-. N,N-dimethyl-O-n-propyl, N,N-dimethyl-O-isopropyl-, N,N-dimethyl-O-n-butyl-. N,N-dimethyl-O-sec.-butyl-, N.N-dimethyl-0-tert.-butyl, N,N-di-methyl-0-isobutyl-, N,N-dimethyl-0-(3-ethylhexyl)-, and N,N-di-methyl-0- hexyl-phosphoric acid ester amide halides and the corresponding thiono analogues;  
  0,0-dimethyl-, 0,0-diethyl, 0,0-di-n-propyl-, 0,0-diisopropyl-, 0,0-di-n-butyl-. 0,0-di-sec.-butyl-, (LO-ditert.-butyland 0,0-di-isobutyl-phosphoric acid ester halides and the corresponding thiono analogues; and  
  0-methyl-, 0-ethyl-, 0-n-propyl-, 0-isopropyl-, O-nbutyl-, 0-isobutyl-, 0-tert.-butyl-. O-sec.-butyl-. 0- pentyl-, O-2-methylbutyl-, 0-hexyl-, 0-2- methylpentyl(4)-, O-2-ethylbutyl( l 0-2,2- dimethylbutyl( l 0-octyl-, 0-2-ethylhexyl-, and 0-2,2-dimethylhexyl-benzene-, -methane-, -ethane-, -propaneand -butane-phosphonic acid ester halides and the corresponding thiono analogues.  
  The preparative process is preferably carried out with the use of a suitable solvent or diluent. Practically all inert organic solvents can be used, especially aliphatic and aromatic optionally chlorinated hydrocarbons, such as benzene, toluene, xylene, benzine, methylene chloride, chloroform, carbon tetrachloride and chlorobenzene; ethers, such as diethyl ether, dibutyl ether and dioxane; ketones,- for example acetone, methyl ethyl ketone, methyl isopropyl ketone and methyl isobutyl ketone; and nitriles, such as acetonitrile and propionitrile.  
  Any customary acid-acceptor can be used as the acid-binding agent. Alkali metal carbonates and alcoholates, such as sodium carbonate, potassium carbonate, sodium methylate and ethylate and potassium methylate and cthylate, have proved particularly suitable, as have aliphatic, aromatic and heterocyclic amines, for example triethylamine, dimethylamine, dimethylaniline, dimethylbenzylamine and pyridine.  
  The reaction temperature can be varied over a fairly wide range. In general, the reaction is carried out at about 0 to 120C, preferably at about to 75C.  
 In general, the reaction is carried out at normal pressure.  
  To carry out the process, the starting substances are generally reacted in equimolar amounts, in a suitable solvent. at the indicated temperatures and in the presence of an acid-binding agent. After continuing to stir for one or more hours, the reaction mixture is worked up in the usual manner by taking it up in an organic sol- N,N-dimethyl-0-ethyl-,  
 \ N OH b g I (Ila) vent, for example benzene, eluting soluble constituents with water and sodium hydroxide solution and drying and concentrating the benzene phase.  
  The compounds obtained in a crystalline form are generally characterized by their melting points.  
  The compounds obtained in the form of colorless to slightly colored oils can in most cases be purified by distillation; those. that decompose easily can be freed of the last volatile constituents, and thus purified, by socalled slight distillation, that is to say by prolonged heating to moderately elevated temperatures under reduced pressure. The oils are generally characterized by their refractive indexes.  
  As has already been mentioned, the new quinoxalyl- (thiono)phosphoric(phosphonic) acid esters and ester amides are distinguished by an excellent insecticidal, especially soilinsecticidal, and acaricidal activity towards plant pests, pests harmful to health and pests of stored products. They possess a good action against both sucking and biting insects and against mites (Acarina). At the same time they display a low phytotoxicity and a number of them also display fungicidal activity.  
  To the sucking insects contemplated&#39;herein there belong, in the main, aphids (Aphidae) such as the green peach aphid (Myzus persicae), the bean aphid (Doralis 40 fabae), the bird cherry aphid (Rlzopalosiphum pudi), the  
 pea aphid (Macrosiplmm pisi) and the potato aphid (Mucrosip/mm solumfolii). the currant gall aphid (Cryp-- wmyzus korschelti), the rosy apple aphid (Suppap/zis muli), the mealy plum aphid (Hyaloprerus urundinis) and the cherry black-fly (Myzus cerasi); in addition,- scales and mealybugs (Coccina), for example the oleander scale (Aspidiotus lzederae) and the soft scale (Lecanium hesperidum) as well as the grape mealybug (Pseudocor&#39;cus maritimus); thrips (Thysanoptera), such as Hercinvthrips femoralis, and bugs, for example the beet bug (Piesma quadrata), the red cotton bug (Dys sit&#39;ae), the small winter moth (Cheimatobia brumara),  
 the green oak tortrix moth (Tortrix viria&#39;una), the fall armyworm (Lap/zygma frugiperda) and cotton worm (Prodeniu litura), the ermine moth (Hypolwmeula padella), the Mediterranean flour moth (Ep/iestiu kulzniella) and greater wax moth (Galleria meIIune/Ia); and the like.  
  Also to be classed with the biting insects contemplated herein are beetles (Coleoptera), for example the granary weevil (Simplzilus grunarius Calana&#39;ra granaria), the Colorado beetle (Leptinotarsu decemlineata), the dock beetle (Gustrophysa viridula), the mustard beetle Plum/0n cochlear-Me), the blossom beetle (Meliger/zes aeneus), the raspberry beetle (Byrurus rmnentosus), the bean weevil (Bruc&#39;hidius Ac&#39;an- [haste/ides obrectus), the leather beetle Dermesres frischi), the khapra beetle (Trogoderma granarium), the flour beetle (Tribolium castaneunz), the northern corn billbug (Calamlra or Sitophilus zeamuis), the drugstore beetle (Sregobium paniceum), the yellow mealworm (Tenebrio molitor) and the saw-toothed grain beetle (Oryzaep/zilus .s&#39;m&#39;inumensis), and also species living in the soil, for example wireworms (Agriotes spec.) and larvae of the cockchafer (Melolontha melolontlru); cockroaches, such as the German cockroach (Blurrellu germanica), American cockroach (Periplaneta americ-una), Madeira cockroach (Leucoplzaea or Rlzyparobia maderae), oriental cockroach (Blattu orienralis), the giant cockroach (Blaberus giganteus) and the black giant cockroach (Blaberus fuscus) as well as Henschouredenia flexivitta; further, Orthoptera, for example the house cricket (Ac/zeta domestic-us); termites such as the eastern subterranean termite (Rericulitermes flavipes) and Hymenoptera such as ants, for example the garden ant (Lasius niger); and the like.  
  The Diptera contemplated herein comprise essentially the flies, such as the vinegar fly (Drusoplzila melanogaster), the Mediterranean fruit fly (Cerarhis capitam), the house fly (Musca donzesticu), the little house fly (Fanniu c&#39;unicularis) the black blow fly (Plwrmia regina) and bluebottle fly (CaIIip/rora er tlzmceplmlu) as well as the stable fly (Slonwxys calcitrans); further. gnats, for example mosquitoes such as the yellow fever mosquito (Aedes aegypti the northern house mosquito (Culex pipiens) and the malaria mosquito (Anopheles stephensi); and the like.  
  With the mites (Acari) contemplated herein there are classed, in particular. the spider mites (Tetranychidae) such as the two-spotted spider mite (Tetranychus telarius Terran \&#39;cl1u.s&#39; alrhaeae or Tetmnyclms urticae) and the European red mite (Paratetranyc/zus pilosus Panonychus ulmi), gall mites, for example the black currant gall mite (Eriophyes ribis) and tarsonemids, for example the broad mite (Hemitursonemus lurus) and the cyclamen mite (Tarsonemus pallidus); finally, ticks, such as the relapsing fever tick (Orni- Ilrodorus moubara); and the like.  
  When applied against hygiene pests and pests of stored products, particularly flies and mosquitoes, the compounds of the invention are also distinguished by an outstanding residual activity on wood and clay, as well as a good stability to alkali on limed substrates.  
  The active compounds according to the instant invention can be utilized, if desired, in the form of the usual formulations or compositions with conventional inert (i.e. plant compatible or herbicidally inert) pesticide diluents or extenders, i.e. diluents, carriers or extenders of the type usable in conventional pesticide formulations or compositions, e.g. conventional pesticide dispersible carrier vehicles such as gases, solutions, emulsions, suspensions, emulsifiable concentrates, spray powders, pastes, soluble powders, dusting agents, granules, etc. These are prepared in known manner, for instance by extending the active compounds with conventional pesticide dispersible liquid diluent carriers and/or dispersible solid carriers optionally with the use of carrier vehicle assistants, e.g. conventional pesticide surface-active agents, including emulsifying agents and/or dispersing agents, whereby, for example, in the case where water is used as diluent, organic solvents may be added as auxiliary solvents. The following may be chiefly considered for use as conventional carrier vehicles for this purpose: aerosol propellents which are gaseous at normal temperatures and pressures, such as freon; inert dispersible liquid diluent carriers, including inert organic solvents, such as aromatic hydrocarbons (e.g. benzene, toluene, xylene, alkyl naphthalenes, etc. halogenated, especially chlorinated, aromatic hydrocarbons (e.g. chlorobenzenes, etc.), cycloalkanes (e.g. cyclohexane, etc.), paraffins (e.g. petroleum or mineral oil fractions), chlorinated aliphatic hydrocarbons (e.g. methylene chloride, chloroethylenes, etc.), alcohols (e.g. methanol, ethanol, propanol, butanol, glycol, etc.) as well as ethers and esters thereof (e.g. glycol monomethyl ether, etc.), amines (e.g. ethanolamine, etc.), amides (e.g. dimethyl formamide, etc.),  
 sulfoxides (e.g. dimethyl sulfoxide, etc.), acetonitrile,  
 ketones (e.g. acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, etc.), and/or water; as well as inert dispersible finely divided solid carriers, such as ground natural minerals (e.g. kaolins, clays, alumina, silica, chalk, i.e. calcium carbonate, talc, attapulgite, montmorillonite, kieselguhr, etc.) and ground synthetic minerals (e.g. highly dispersed silicic acid, silicates, e.g. alkali silicates, etc.); whereas the following may be chiefly considered for use as conventional carrier vehicle assistants, e.g. surface-active agents, for this purpose: emulsifying agents, such as non-ionic and- /or anionic emulsifying agents (e.g. polyethylene oxide esters of fatty acids, polyethylene oxide esters of fatty alcohols, alkyl sulfates, alkyl sulfonates, aryl sulfonates, etc., and especially alkyl arylpolyglycol ethers, magnesium stearate, sodium oleate, ctc.); and/or dispersing agents, such as lignin, sulfite waste liquors, methyl cellulose, etc.  
  Such active compounds may be employed alone or in the form of mixtures with one another and/or with such solid and/or liquid dispersible carrier vehicles and/or with other known compatible active agents, especially plant protection agents, such as other insecticides. acaricides and fungicides, or bactericides, rodenticides, nematocides, herbicides fertilizers, growth-regulating agents, etc., if desired, or in the form of particular dosage preparations for specific application made therefrom, such as solutions, emulsions, suspensions, powders, pastes, and granules which are thus ready for use.  
  As concerns commercially marketed preparations, these generally contemplate carrier composition mixtures in which the active compound is present in an amount substantially between about 0.1-7: by weight, and preferably 05-90% by weight, of the mixture, whereas carrier composition mixtures suitable for direct application or field application generally contemplate those in which the active compound is present in an amount substantially between about 0.0001-1071 preferably 0.0l-l7t, by weight of the mixture. Thus, the present invention contemplates over-all compositions which comprises mixtures of a conventional dispersible carrier vehicle such as (l) a dispersible inert finely divided carrier solid, and/or (2) a dispersible carrier liquid such as an inert organic solvent and/or water preferably including a surface-active effective amount ofa carrier vehicle assistant, e.g. a surface-active agent, such as an emulsifying agent and/or a dispersing agent, and an amount of the active compound which is effective for the purpose in question and which is generally between about 0.000 l-95/c, and preferably 0.0 l95&#39;/1, by weight of the mixture.  
  The active compounds can also be used in accordance with the well known ultra-low-volume process with good success, i.e. by applying such compound if normally a liquid, or by applying a liquid composition containing the same, via very effective atomizing equipment, in finely divided form, e.g. average particle diameter offrom 50-100 microns, or even less, i.e. mist form, for example by airplane crop spraying techniques. Only up to at most about a few liters/hectare are needed, and often amounts only up to about to 1000 g/hectare, preferably 40 to 600 g/hectare, are sufficient. In this process it is possible to use highly concentrated liquid compositions with said liquid carrier vehicles containing from about to about 95% by weight of the active compound or even the 100% active substance along, e.g. about 20-l00/r by weight of the active compound.  
 Furthermore, the present invention contemplates methods of selectively killing, combating or controlling 7 pests, e.g. insects, acarids and fungi, and more particularly methods of combating at least one of insects and acarids, which comprises applying to at least one of correspondingly (a) such insects. (b) such acarids, (c)  
 EXAMPLE 1 Plutella test Solvent: 3 parts by weight acetone E mulsifier: l part by weight alkylaryl polyglycol ether To produce a suitable preparation of active compound, l part by weight of the active compound is mixed with the stated amount of solvent containing the stated amount of emulsifier and the concentrate is diluted with water to the desired concentration,  
  Cabbage leaves (Brassica olerucea) are sprayed with the-preparation of the active compound until dew moist and are then infested with caterpillars of the diamondblack moth (Plutella maculipennis).  
 such fungi, and (d) the corresponding habitat thereof, After the specified periods of time, the degree of dei.e., the locus to be protected, a correspondingly combative or toxic amount, i.e., an insecticidally, acaricidally or fungicidally effective amount, of the particular active compound of the invention alone or together with a carrier vehicle as noted above. The instant formulations or compositions are applied in the usual struction is determined as a percentage: 100% means that all the caterpillars are killed whereas 0% means that none of the catepillars are killed.  
  The active compounds, the concentrations of the active compounds, the evaluation time and the results can be seen from the following Table l:  
 liable l (insects that damage plants) my test Degree of Active compound destruction concentration in 7; after Active Compounds in 7. by weight 3 days S II  S 0 .1 ll 0-P(OC H 0.01 100 01-1 0 O .001 30 1 1 1-2; (continued) (insects that damage plant!) Plutella teat Degree of Active coupound destruction concentration 1;:- 1 after Active Coqmunda in Z by weight: Sdeye 5 ca 1 100 0. 01 100 CH 0 2 5 3 O. O01 I00 s CH 0 1 100 ll 5 1 0 .01 100 CH 0 B T S c H 0 1 100 i&#39;,/ 2 5 CH O 2 5 S c H 0 1 100 0-i 2 5 CH j 3 0 .01 10o 3 Z-Q- o .001 CH ,/3 H 0 .1 100 0 01 so oc 3 @i z&#39;q &#39;q z&#39; b 0.001 30 s II O-P(0CH CH 0 0.1 1,00 3 0.01 95 0.001 S (2) II C H 0 p 2 5 0.1 100 0. Q1 1 O0 B QEE J 5 7 0. 001  
  EXAMPLE 2 heavily infested with peach aphids (M yous pens-inn) are MyZuS test (Contact action) sprayed with the preparation of the active compound Solvent: 3 parts by weight acetone 60 umlidnppmg I Emulsifier: 1 part by weight alkylarylpolyglycol ether the Speclfied Perlods of the degree 0t T produce a i bl preparation f active struction is determined as a percentage: 100% means pound, 1 part by weight f the active compound i that all the aphids are killed whereas 0% means that mixed with the stated amount of solvent containing the of the aphids are killedstated amount of emulsifier and the concentrate is di- The active compounds, the concentrations of the acluted with water to the desired concentration. tive compounds, the evaluation times and the results Cabbage plants (Brassica oleraceu) which have been can be seen from the following Table 2:  
 EXAMPLE 3 Tetranychus test/resistant Solvent: 3 parts by weight acetone Emulsifier: 1 part by weight alkylaryl polyglycol ether To produce a suitable preparation of active compound, 1 part by weight of the active compound is mixed with the stated amount of solvent containing the stated amount of emulsifier and the concentrate so obtained is diluted with water to the desired concentration.  
  Bean plants (P/MLWOIHS vulgaris), which have a height of approximately 10-30 cm., are sprayed with the preparation of the active compound until dripping wet. These bean plants are heavily infested with the twospotted spider mite Tetranychus urticae) in all stages of development.  
  After the specified periods of time, the effectiveness of the preparation of active compound is determined by counting the dead mites. The degree of destruction thus obtained is expressed as a percentage: 100% means that all the spider mites are killed whereas 0% means that none of the spider mites are killed.  
  The active compounds, the concentrations of the active compounds, the evaluation times and the results can be seen from the following Table 3:  
 .Ta&#39;bleg EXAMPLE 4 Critical concentration test/soil insects Test insects: Plwrlriu brassivae/grubs in the soil Solvent: 3 parts by weight acetone Emulsifier: 1 part by weight alkylarylpolyglycol ether To produce a suitable preparation of active compound, 1 part by weight of active compound is mixed with the stated amount of solvent, the stated amount of emulsifier is added and the concentrate is diluted with water to the desired concentration The preparation of active compound is intimately mixed with soil. The concentration of the active compound in the preparation is of practically no importance; only the amount of active compound per unit volume of soil, which is given in ppm (for example mg/l is decisive. The soil is filled&#39;into pots and the pots are left to stand at room temperature. After 24 hours, the test insects are put into the treated soil and, after a further 48 hours, the degree of effectiveness of the active compound is determined as a percentage by counting the dead and living test insects. The degree of effectiveness is 100% if all test insects have been killed; it is 0% when exactly as many test insects are still alive as in the case of the control.  
  The active compounds, the amounts applied and the results can be seen from the following Table 4:  
 (mites harmful to plants) Tetranychus test (resistant) Active compound Degree of dos- Active compounds concentration in 75 by weight after 2 days truction in $3 (known) C H /N\ O-P 2 5 (c) erg-Q :l 0 a (known) Fa s Phorbia brassicae grubs in the. soil Degree of destruction in $3 at an active-compound concentration Active compound (in ppm) 01 n o OC H (A) m g 2 5 N (known) g): OC H 100 100 90 20 The process of the invention is illustrated by the following preparative Examples.  
 EXAMPLE 5 II N O-P(OCH) 252 44 g (0.25 mole) of 2-l 1ydroxy-6(7)- methoxyquinoxaline and 40 g of potassium carbonate are boiled in 300 ml of acetonitrile for minutes. 47 g (0.25 mole) of 0,0-diethylthiophosphoryl chloride are added dropwise to the reaction mixture at 70C and the whole is stirred for a further 4 hours under reflux. The mixture is cooled and taken up in 300 ml of benzene and the soluble constituents are eluted with water, then with l N NaOH and again with water; the benzene solution is dried over sodium sulfate and evaporated in vacuo. The residue that crystallizes is dissolved in alcohol and the solution is cooled. After standing for some time, white crystals separate out. which are isolated and dried in air. 64 g (78% of theory) of 0,0-diethyl-O- 0 ester of the melting point 60-6lC are obtained.  
 EXAMPLE 6 II 041 oca 2 quinoxaline and g of potassium carbonate are boiled in 300 ml of acetonitrile for 30 minutes. The reaction mixture is cooled to room temperature and 48 g (0.3 mole) of 0.0-dimethylthiophosphoryl chloride are added dropwise. While doing so. the temperature is kept at 20C. The reaction mixture is further stirred overnight. additionally warmed to 35-40C for 1 hour and worked up as in Example I. 38 g (42% of theory) of 0.0-dimethyl-0-6( 7 )-methoxyquinoxalinyl( 2 thionophosphoric acid ester of the melting point 64C are obtained.  
  The following compounds can be prepared by meth ods analogous to those described above:  
 Comx R&#34; 11&#39; Yield Physical data pound (melting point, 7? refractive index) I o o 0C H oc rr 42 mp. 49 0 Y 0 4 .O OC I1 i OC IL i 53 m.p. 68 C -Continued Com- X R&#34; &#39;11 Yield Physical data pound (melting point, No. 7 refractive index) s OC3H71 00 11 1 66 m.p. 58 o O 6 s CH3 oc n I 45 m.p. 60 c 7 s- CH5 oc a i 48 m.p. 70C a s 0 1: 00 11 65 m.p. 62C  
  0 9 S 0 11 00 11 1 44 m. 51 c 24 10 S 0 11 OCH2CH(CH3)2 74 an 1.5658 11 s c H ocH ca(c H 78 n5 1.5505  
 &#39; i i 4 12 s c 11 wa on-(2 11 84 an 1.5465  
  c a 13 s 00 11 75 mp. 69C  
 . 24 14 0 00 11 N(CH3)2 40 a 1.5582  
 15&#39; Q N( H M 119 55 M. 93C  
 o {Ii/R CH3 N/ in which R is alkoxy with up to l0 carbon atoms. R&#34; is alkyl or alkoxy with up to 6 carbon atoms.  
 the CHgO radical is in the 6- or 7- position, and  
 X is oxygen or sulfur.  
  2. A compound according to claim 1, in which R is straight-chain or branched alkoxy having 1 to 8 carbon atoms, and R is straight-chain or branched lower alkyl of l to 4 carbon atoms or alkoxy having 1 to 4 carbon atoms.  
  3. A compound according to claim 1, wherein such compound is 0,0-diethy&#39;l-O-6(7)-methoxy-quinoxalinyl(2)-phosphoric acid ester of the formula 4. A compound according to claim 1, wherein such compound is 0-ethyl-0-6( 7 )-methoxy-quinoxalinyl( 2 methanethionophosphonic acid ester of the formula 5. A compound according to claim 1, wherein such compound is 0-isopropyl-0-6( 7 l-methoxyquinoxalinyl(2)-methanethionophosphonic acid ester of the formula 6. A compound according to claim 1, wherein such compound is 0-ethyl-0-6( 7 )-methoxy-quinoxalinyl( 2 ethanethionophosphonic acid ester of the formula 7. A compound according to claim I, wherein such compound is O-isopropyl-0-6( 7 )-methoxyquinoxalinyl(2)-ethanethionophosphonic acid ester of the formula