反应详情

A solution of 11.5 parts of 2-amino-5-chlorobenzophenone, 11.5 parts of ethyl orthoacetate and 6 volume parts of acetic acid in 100 volume parts of benzene is refluxed for 20 minutes, whereby 5-chloro-2-(1-ethoxyethylideneamino)-benzophenone are obtained as crystals. Recrystallization from methanol-water gives colorless needles melting at 62° to 63° C. Yield: 93%.