Process for the preparation of 5 - amino - 1,2,4 - triazole - 3 - sulfonamide and for the preparation of 5 - amino - 3 - clorossulfonil - 1,2,4 - triazole

摘要

A process for preparing 5-amino-1,2,4-triazole-3-sulfonamides, which are intermediates for substituted 1,2,4-triazolo[1,5-a]-pyrimidine-2-sulfonamide herbicides, in two steps from 5-amino-3-mercapto-1,2,4-triazole by chlorination in a medium containing an aqueous acid to obtain 5-amino-3-chlorosulfonyl-1,2,4-triazole and subsequent condensation of this intermediate with substituted anilines is disclosed. The condensation reaction takes place either in the presence or absence of an acid scavenging base. Novel intermediates are also provided.