Abstract The acid-catalyzed cyclizing addition of sulfamide to cyanogen yielded 3, 4-diamino- 1, 2, 5-thiadiazole 1, 1-dioxide (2), from which through amino-exchange reactions, the substituted compounds 3, 4, and 5 could be derived. The unsubstituted amino groups of compounds 2 and 3 were easily hydrolyzed by basic treatment; the former afforded the 4- amino-3-oxothiadiazole 8 or the dipotassium salt 6 depending on the conditions, and the ...
