Pyrazophos (CAS 13457-18-6)

Pyrazophos falls under the category of organophosphorus pesticides, widely employed in agriculture and plant care for both household and agricultural purposes. Its action encompasses a broad spectrum, and it exhibits a shorter persistence in the environment when compared to organochlorine pesticides. Chemically, Pyrazophos is classified as a pyrazolopyrimidine compound, specifically the ethyl ester of 2-[(diethoxyphosphorothioyl)oxy]-5-methylpyrazolo[1,5-a]pyrimidine-6-carboxylic acid. Acting as a profungicide, it can hydrolyze the thionophosphate group, transforming into the corresponding 2-hydroxypyrazolopyrimidine fungicide. Its efficacy lies in controlling Erysiphe, Helminthosporium, and Rhynchospium in cereals. Remarkably, Pyrazophos serves various roles, functioning as a phospholipid biosynthesis inhibitor, an insecticide, an antifungal agrochemical, and a profungicide. Its chemical structure comprises a pyrazolopyrimidine, an organic thiophosphate, and an ethyl ester, originating from an ethyl 2-hydroxy-5-methylpyrazolo[1,5-a]pyrimidine-6-carboxylate. Given its versatile nature and usefulness, Pyrazophos holds significance in the realm of pesticide applications.