Synthesis of new O,O -dialkyl-O-coumarinophosphorothioates and their pesticidal bioassay agianst Helicoverpa armigera

摘要

A series of compounds O,O-dialkyl-O-coumarinophosphoro-thioates have been synthesized and screened for pesticidal activities against Helicoverpa armaigera. Some of the compounds (3,4,6 and 7) show significant activities while rest of the compounds show moderate activities.