Pyrazole derivative and herbicidal composition

摘要

PCT No. PCT/JP96/00260 Sec. 371 Date Oct. 27, 1997 Sec. 102(e) Date Oct. 27, 1997 PCT Filed Feb. 7, 1996 PCT Pub. No. WO96/24589 PCT Pub. Date Aug. 15, 1996A pyrazole derivative represented by the general formula (1a) or (1b): wherein R1 represents a hydrogen atom or a pesticidally acceptable protecting group; R2 and R3 represent a phenyl, 1-naphthyl or 2-naphthyl group, or a 5-6 membered heterocyclic ring and the like; R4 represents a hydrogen or halogen atom, or a alkyl, alkoxy or alkylthio group; and a herbicidal composition containing the pyrazole derivative.