Ishihara Sangyo Kaisha, Ltd.

Kohji Minamida

Takahiro Haga

Toshio Nakajima

Tetsuji Nishikawa

Masaru Maeda

4-Benzoyl-5-hydroxypyrazoles useful as herbicidal active ingredients, their intermediate or stabilizers against heat, oxidation or ultraviolet light are produced by a condensation of a pyrazolone, tetrachloromethane and a benzene compound in the presence of an aluminium halide, followed by a hydrolysis reaction with industrial advantages.

Process for producing 4-benzoylpyrazoles

4-Benzoyl-5-hydroxypyrazoles useful as herbicidal active ingredients or their intermediate are produced by a condensation of a pyrazolone and a benzotrichloride followed by a hydrolysis reaction with industrial advantages.

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Shiga, Japan

Kohji Minamida