Synthesis and insecticidal properties of some 2-substituted-3-oxo-4-halo-5(2H)-pyridazinyl phosphorus esters

A series of novel esters of organophosphorus compounds were prepared from 2-substituted-4-halo-5-hydroxy-3(2H)-pyridazinone and their insecticidal effects were studied. Many of the compounds prepared showed insecticidal and acaricidal contact activity.