Process for the preparation of N-substituted imido-dicarboxylic acid diaryl esters

Claim 1

Process for the production of an N-substituted imido-dicarboxylic acid diaryl ester compound of the formula R.sup.1 -N(CO-OR.sup.2).sub.2 (I) wherein R 1 is a straight-chain or branched alkyl of from 1 to 10 carbon atoms; substituted alkyl wherein the substituents are at least one of lower alkoxy, lower alkylmercapto, halogen, cyano or nitro; alkenyl or alkynyl of from 3 to 8 carbon atoms; cycloaliphatic of from 3 to 8 carbon atoms; substituted by cycloaliphatic wherein the substituent is lower alkyl; araliphatic with from 7 to 12 carbon atoms; substituted araliphatic wherein the aromatic ring system is substituted by halogen, nitro, trifluoromethyl, cyano, lower alkyl or lower alkoxy; an aromatic radical of from 6 to 12 carbon atoms and is optionally substituted by halogen, nitro, trifluoromethyl, cyano, lower alkyl or lower alkoxy; R 2 is a phenyl or naphthyl radical; substituted phenyl or naphthyl wherein the substituents are at least one of chlorine, methyl or methoxy; and which process comprises reacting an amine salt of the formula R.sup.1 -NH.sub.2 HX.sup.1 (I) in which R 1 is defined as above; and X 1 is a chlorine atom with a carbonic acid aryl ester halide of the formula R.sup.2 O--CO--X.sup.2 (III) wherein R 2 is defined as above; and X 2 is a chlorine or fluorine atom at a temperature from 100° C. to 300° C.