Process for producing 4-benzoyl-5-hydroxypyrazoles
USRE34408E · kind E · reissue
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Key dates
| Filing date | May 20, 1992 |
| Grant date | Oct 12, 1993 |
| Priority date | — |
| Expiry date | May 20, 2012 |
Classification
- Technology area (CPC —)General
Abstract
A process for producing a 4-benzoyl-5-hydroxylpyrazole of the formula III: ##STR1## which comprises reacting carbon monoxide and a 5-hydroxypyrazole of the formula II: ##STR2## to a substituted benzene of the formula I: ##STR3## wherein X is a bromine atom, an iodine atom or a diazonium tetrafluoroboron salt group, in the presence of a base and a catalyst of Group VIII of the Periodic Table.
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