A convenient method for synthesis of bis-2,2'-(1,3,4-thiadiazole) and bis-3,3'-(1,2,4-triazole) derivatives.

Reactions of the bis-hydrazonoyl chloride 1 with ketene N,S-acetal 2 and the active methine thioanilides 4 and 6 provide a new convenient site-selective synthetic strategy to functionalized bis-3,3'-(1,2,4-triazoles) 3 and bis-2,2'-(1,2,4-thiadiazoles) 5 and 7. [image omitted] [ABSTRACT FROM AUTHOR]