发明授权
US4994611A Process for the production of N,N'-bis-(3-aminophenyl)-ureas 失效
制备N,N'-二 - (3-氨基苯基) - 脲的方法

Process for the production of N,N'-bis-(3-aminophenyl)-ureas
摘要:
The present invention is directed to a process for the preparation of N,N'-bis-(3-aminophenyl)-ureas corresponding to formula (I) ##STR1## wherein R represents a linear or branched C.sub.1 -C.sub.6 alkyl group which is in the 2-, 4- and/or 6-position,characterized in that the corresponding phenylene diamines are reacted with urea in a molar ratio of greater than 2:1 in chlorobenzene as solvent.
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