反应详情

648 g of 3,4-dichloroaniline, 360 g methyl carbamate, 280 g N,N'-bis-(3,4-dichlorophenyl)-urea, 385 g methanol and 1600 g chlorobenzene were reacted in the apparatus described in Example 1 for 6.0 hours at 200° C. After the apparatus had cooled and the pressure had been reduced, the reaction mixture was removed, filtered and analyzed by high pressure liquid chromatography (HPLC). A yield of 990 g (80% of the theoretical yield) of N-(3,4-dichlorophenyl)-carbamic acid-methyl ester was obtained.

1. temperatureAfter the apparatus had cooled
2. customthe reaction mixture was removed
3. filtrationfiltered