Pyridazinone derivative, its preparation and selective herbicide containing said derivative

Abstract

Abstract NEW MATERIAL:A pyridazinone derivative expressed by formulaI(X is H, halogen, lower alkyl or lower alkoxyl; Y is H, halogen or lower alkyl). USE:A selective herbicide exhibiting a weeding activity against a wide range of plants including annual broad-leaved and perennial weeds in a long period from the initial to the growth periods without giving the phytotoxicity to cotton, soybean, rice plant, wheat, barley, etc. PROCESS:A compound of formula II is reacted with a benzyl halide derivative expressed by formula III (Z is halogen) in an inert organic solvent in the presence of an acid acceptor at 80-130 deg.C to give the compound of formulaI. The compound of formula II is obtained by dissolving a compound of formula IV in a hydrous lower alcohol in the presence of an alkali at 50-80 deg.C, reacting them under refluxing, and adding a mineral acid to the reaction mixture.

Inventors

• 👤 Masakazu Taniguchi
• 👤 谷口　政和
• 👤 Masanori Baba
• 👤 馬場　正紀
• 👤 Takashi Igai
• 👤 猪飼　隆
• 👤 Toshihiko Oguchi
• 👤 小口　寿彦
• 👤 Tsutomu Nawamaki
• 👤 繩巻　勤

Bibliographic Details