N-(α-Chlorobenzylidene) carbamoyl chloride (1) reacts with hydrazine hydrate to give 3- phenyl-1, 2, 4-triazolone (2), with sodium azide in the presence of water to give 5- phenyltetrazole (3), and with aliphatic nitriles in the presence of hydrogen chloride to give 6- chloro-2-phenyl-5-substituted-4 (3H)-pyrimidones (5) and 4, 6-dichloro-2-phenyl-5- substituted pyrimidines (6). However, the reaction of 1 with trichloroacetonitrile or ...
