foreign foreign oprure piridazinil tiol phosphoric fosfonici starches and process for their preparation and their use as insecticides, and as acaricidi

摘要

Novel pyridazinyl(thiono)(thio)phosphates(phosphonates) or -phosphoramidates(phosphonamidates) of the formula I IMAGE are obtained by reacting a suitably substituted phosphorus-halogen compound with a suitably substituted 3-hydroxy-1,6-dihydropyridazinone compound with the elimination of hydrogen halide. In the formula I, R denotes alkyl having 1-6 C atoms, R' denotes phenyl, alkyl having 1-4 C atoms, alkoxy having 1-6 C atoms, alkylthio having 1-6 C atoms, monoalkylamino or dialkylamino having 1-4 C atoms per alkyl, R'' and R''' denote H or CH3, RIV denotes hydrogen, halogen, a nitro group or haloalkyl having 1-3 C atoms, X denotes oxygen or sulphur, and n denotes 1 to 4. The novel compounds have a very good insecticidal and acaricidal activity combined with a low phytotoxicity and toxicity to warm-blooded animals.