Process for producing 4-benzoylpyrazoles
AssigneeIshihara Sangyo Kaisha, Ltd.
InventorsTakahiro Haga, Tetsuji Nishikawa, Toshio Nakajima, Kohji Minamida, Masaru Maeda
Life of this patent
Estimating the term…
Abstract
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.
Claims8
A process for producing a 4-benzoyl-5-hydroxypyrazole represented by the formula ##STR4## wherein R is a hydrogen atom or a lower alkyl group, which comprises a condensation reaction of a pyrazolone represented by the formula ##STR5## wherein R is the same defined as above, and a benzotrichloride represented by the formula ##STR6## followed by a hydrolysis reaction.
Dependencies are inferred from the claim text.