Ammonia → Ethyl N-phenylcarbamate

Participants

Reaction Steps

637 g of N,N'-diphenyl urea, 267 g of ethyl carbamate and 1880 g of ethanol (approximately 96%) were reacted for 8.5 hours at 200° C. in the pressure apparatus described in Example 1, with the ammonia gas given off being removed. After cooling and venting of the apparatus, the reaction mixture was removed, filtered and subjected to fractional distillation. Excess alcohol was initially distilled off at atmospheric pressure, after which the mixture was distilled off at 0.2 mbar. 766 g (77.3% of the theoretical yield) of N-phenyl carbamic acid ethyl ester which solidified into crystals melting at from 48° to 51° C. were produced.

Provenance & Evidence