Synthesis of 1,3,4-thiadiazines, bis-1,3,4-thiadiazoles, [1,2,4]triazino[3,4-b][1,3,4]thiadiazine, thiazolines from carbonothioic dihydrazide

A novel and efficient synthesis of 1,3,4-thiadiazines, bis-1,3,4-thiadiazoles, [1,2,4]triazino[3,4-b][1,3,4] thiadiazine, and thiazolines is reported from the reaction of alpha-haloketo hydrazonoyl halides with carbonothioic dihydrazide or its analogues. The structures were elucidated on the basis of their elemental analysis, spectral data and an alternative synthetic route. (C) 2012 Elsevier Ltd. All rights reserved.