The reaction of N-(1-methyl-2-phenylvinyl)acetimidoyl chloride and its
derivatives substituted at the benzene ring with N,N-dimethylcyanamid
e was studied. At the first stage, linear products like -3,5-dimethyl-
6-phenyl-2,4-diaza-1,3,5-hexatrienes were obtained. They underwent cyc
lization to 4-dimethylamino-2,6-dimethyl-5-phenylpyrimidines in alkali
ne medium at elevated temperature.