Studies on Organophosphorus Insecticides

Abstract

When phosphorothioates had the CH₃-O-P linkage, they reacted with pyridine and consequently the linkage was cut off. Phosphorothioates having other alkyl-O-P linkages did not react with pyridine in the same condition as the above. Namely, O,O-dimethyl phosphorochloridothioate reacted with pyridine and produced mainly methylchloride and an oily product whose experimental formula is (CH₃O) PSO^-N⁺C₅H₅, and one mole ratio of O,O-dimethyl-O- (4-nitrophenyl) phosphorothioate also reacted with two moles ratio of pyridine and produced di- (N-methyl pyridinium) salt of O- (4-nitrophenyl) phosphorothioic acid.