T 1431 (OTTO) p-Toluenesulfonyl hydrazide, 97% Cas 1576-35-8 - used as a reagent for the preparation of tosylhydrazones. T 1431 (OTTO) p-Toluenesulfonyl hydrazide, 97% Cas 1576-35-8 - used to prepare dipyrazolo[1,5-a:4?,3?-c]pyridines and 1,2,3-selenadiazole derivatives.