Urea → Ethyl N-phenylcarbamate

Participants

Reaction Steps

Following the procedure of Example 1, 745 g of aniline, 849 g of N,N'-diphenyl urea, 480 g of urea, 356 g of ethyl carbamate and 1350 g of ethanol (approximately 96%) were reacted for 5.5 hours at 200° C. in the pressure apparatus described in Example 1. After cooling and venting of the apparatus, the reaction mixture was removed, filtered and subjected to fractional distillation. After the excess alcohol had been separated (at normal pressure), the remaining fraction was subjected to distillation at 0.2 mbar. 1934 g (73.2% of the theoretical yield) of N-phenyl carbamic acid ethyl ester melting at from 49° to 51° C. were produced.

Provenance & Evidence