[Synthesis of 2-substituted derivatives of 5H-1,2,4-thiadiazolo[3,2-a] [1,3,5]triazin-5-one].

The synthesis of 2-substituted derivatives of 5H-1,3,4-thiadiazolo[3,2-a] [1,3,5]triazin-5-one, obtained from 5-substituted 2-amino-1,3,4-thiadiazoles is described. The structure of the new compounds is confirmed by U.V. and I.R. spectra and partly by mass spectrometry.