N-SUBSTITUEREDE IMIDO-DICARBOXYLSYREDIARYLESTERE SAMT FREMGANGSMAADE TIL FREMSTILLING DERAF

1. Process for the preparation of N-substituted imidodicarboxylic acid diarylesters of the general formula I R**1 -N(CO-OR**2 )2 in which R**1 represents a straight-chain or branched alkyl radical which has 1-10 C atoms and can optionally be substituted by lower alkoxy, lower alkylmercapto, halogen, cyano or nitro ; an alkenyl radical with 3-8 C atoms ; an alkinyl radical with 3-8 C atoms ; a cycloaliphatic radical which has 3-8 C atoms and can optionally be substituted by lower alkyl ; an araliphatic radical with 7-12 C atoms, it being possible for the aromatic ring system optionally to be substituted by halogen, nitro, trifluoromethyl, cyano, lower alkyl and/or lower alkoxy ; an aromatic radical with 6-12 C atoms, which can optionally be substituted by halogen, nitro, trifluoromethyl, cyano, lower alkyl and/or lower alkoxy, or a heterocyclic radical with 5-6 ring atoms, it being possible for 1-3 hetero atoms to be present in the ring system, and R**2 represents a phenyl or naphtyl radical which is optionally substituted by chlorine, methyl and/or methoxy, characterised in that primary amines of the general formula II R**1 -NH2 in which R**1 has the abovementioned meaning, are reacted with carbonic acid aryl ester halides of the general formula III X-CO-OR**2 in which R**2 has the abovementioned meaning and X represents halogen, in the presence of a diluent, without the addition of an acid-binding agent, at temperatures between 100 and 300 degrees C.