Process for producing acyloxy aromatic carboxylic acids
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United States of America Patent
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Sep 8, 1987
Issued Date -
N/A
app pub date -
Sep 25, 1985
filing date -
Jul 24, 1984
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Expired
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Abstract
Acyloxy aromatic carboxylic acids, e.g., 4-acetoxybenzoic acid, are prepared by oxidizing with oxygen an acyloxy aromatic ketone, e.g., 4-acetoxyacetophenone in the presence of manganese cations and a lower-carboxylic acid anhydride as catalyst and a co-reductant or promoter. The acyloxy aromatic ketone may be prepared by acylating a hydroxy aromatic ketone, e.g., 4-hydroxyacetophenone, which has the effect of 'masking' the hydroxyl group of the ketone in a manner necessary to effect the subsequent transition-metal catalyzed oxidation of the ketone to the acyloxy aromatic carboxylic acid.
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