Verfahren zur Herstellung von N-Arylharnstoffen

摘要

1,232,038. N-aryl ureas. FARBENFABRIKEN BAYER A.G. 7 Aug., 1968 [12 Aug., 1967; 22 March, 1968], No. 37705/68. Heading C2C. [Also in Division A5] The invention relates to N-aryl ureas of a general formula in which R 1 is hydrogen, an alkyl radical with 1-4 carbon atoms or an alkenyl radical with 2-4 carbon atoms, and R 2 is an alkyl radical with 1-4 carbon atoms or an alkenyl radical with 2-4 carbon atoms. Compounds claimed per se are those in which R 1 and R 2 are both methyl and ethyl and in which R 1 is hydrogen and R 2 methyl. The compounds may be prepared by reacting 3-chloro-4-trifluoromethylphenyl isocyanate in the presence of a solvent with an amine of the formula HNR 1 R 2 . In an example 3-chloro-4-trifluoromethylphenyl isocyanate dissolved in chlorobenzine is reacted with dimethyl aniline to produce 3-chloro-4- trifluoromethylphenyl dimethyl urea.