Abstract 2, 4-Dichloro-5-fluorophenyl containing 7-arylidenetriazolothiadiazines were obtained by the reaction of 4-amino-3-(2, 4-dichloro-5-fluorophenyl)-5-mercapto-1, 2, 4- triazole with 2, 3-dibromo-1, 3-diarylpropan-1-ones, and also by the reaction of 4-amino-3- (2, 4-dichloro-5-fluorophenyl)-5-mercapto-1, 2, 4-triazole with α-bromopropenones in the presence of a base. The structure of the 7-arylidenetriazolothiadiazines was confirmed by ...