| abstract |
(57) [Summary] [Structure] General formula (I) [In the formula, R is an alkyl group, haloalkyl group, alkenyl group, alkynyl group, alkoxyalkyl group, unsubstituted or substituted phenyl group, phenylalkyl group, phenoxyalkyl group, naphthyl group, pyridyl group, unsubstituted or substituted pyrimidyl group, etc. , R 1 and R 2 represent H, an alkyl group, a haloalkyl group, an alkoxy group, an alkylthioalkyl group, an alkenyl group, an alkynyl group, an alkoxycarbonylalkyl group and a phenylalkyl group, and R 1 and R 2 are (C 3-6 ) It is also possible to bond with an alkylene group. X represents a halogen, a nitro group, a cyano group, an alkyl group, an alkoxy group, an unsubstituted or substituted amino group or the like, or a (C 2-4 ) alkylene group bonded to an adjacent carbon atom, and n is 0 to 5 . ] The 2-pyrazolin-5-one derivative represented by these, its intermediate, and a herbicide containing this derivative. [Effect] It shows an excellent herbicidal effect on weeds before and after emergence, for example, paddy weeds such as barnyard grass, firefly, and eel. |