Isolation and identification of impurities in technical quinalphos

A number of impurities developed in a sample of technical quinalphos on storage were isolated by column and thin-layer chromatography, and the structures of these impurities were determined by nuclear magnetic resonance, infrared, and mass spectroscopy. Non-phosphorus-containing impurities were not active whereas phosphorus containing impurities were as active asquinalphos against Tribolium castaneum Herbst