Manufacture of alpha-arylalkanoic acids and precursors

Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof

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562469, 562496, 560 56, 560 59, 560100, 560105, 564161, 564171, 564182, 568308, 568328, 568335, 568336, 568442, 568592, 568593, 568630, 260686, C07C 6336, C07C 6976

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045422370

ABSTRACT:
.alpha.-Arylalkanoic acids or esters, orthoesters or amides thereof are prepared by forming an .alpha.-hydroxy ketal or thioketal of an aryl alkyl ketone, activating the .alpha.-hydroxy substituent with an esterifying agent to form the corresponding ketal or thioketal ester substrate, wherein the ester group is sufficiently labile to non-catalytically disassociate from the substrate in a protic or dipolar, aprotic solvent, maintaining the ester substrate in contact with the protic or dipolar, aprotic solvent or mixtures thereof for a time sufficient to form the corresponding .alpha.-arylakanoic acid or ester, orthoester or amide thereof, and optionally concomitantly or sequentially hydrolyzing any ester, orthoester or amide formed to the corresponding .alpha.-arylalkanoic acid.

REFERENCES:
patent: 4263443 (1981-04-01), White
patent: 4268442 (1981-05-01), Kondo et al.

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