PURPOSE: To obtain a derivative of 3-CF3 carboxylic acid exhibiting an excellent herbicidal activity at an extremely low dose for a long range from the date of germination to vegetation period against perennial weeds such as Panicum crus-galli or the like growing in paddy field, and having extremely high safety to transplanted paddy rice.
CONSTITUTION: This derivative is expressed by the formula [R is H a (substituted) phenyl a lower alkyl, a lower alkenyl a lower alkynyl or a (substituted)aralkyl or the like, with the proviso that compounds in which-W-R is ethoxy or aniline or hydrazino are excluded], for example, benzyl 3-(trifluoromethyl)-4-methylpentate or the like. This derivative is obtained, for example, by adding 3-(trifluoromethyl)-4-methylpentanoic acid and calcium carbonate to dimethylformamide, then adding benzyl chloride under stirring at room temperature, adding ethyl acetate and water to the reaction solution after stirring for 4 hours, separating the organic layer, drying and concentrating it under reduced pressure.
ARAKI KOICHI
AOKI TAKAKO
YOKOYAMA MASATOSHI
INOUE KUMIKO
KITATSUME TOMOYA
RHONE POULENC AGROCHIMIE
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