New heterocyclic herbicidal sulphonamides

Abstract

Abstract The sulphonylurea structures and their relationships with the 1,2,4‐triazolo[1,5‐ a ]pyrimidinesulphonamides are first discussed. Three novel examples of heterocyclic sulphonamides, pyrazolo[1,5‐ a ]pyrimidine‐2‐sulphonamides, thiazolo[3,2‐ b ][1,2,4]triazole‐2‐sulphonamides and 1,2,4‐triazole‐3‐sulphonamides are highlighted and their synthesis, biological activity and soil behaviour are described.