Process for preparing valproic acid
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United States of America Patent
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Mar 31, 1992
Issued Date -
N/A
app pub date -
Jul 5, 1988
filing date -
Oct 30, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for preparing valproic acid which comprises: (I) producing a 2,2-dipropyl acetoacetic acid ester from an acetoacetic acid ester, (II) deacetylating the 2,2-dipropyl acetoacetic acid ester with an alcohol to give a valproic acid ester, and (III) hydrolyzing the valproic acid ester. In the process of the present invention, valproic acid can be prepared in a high yield as not less than 85% by mole and by-products such as .alpha.-propyl-.beta.-ethyl acrylic acid and its esters which cannot be easily separated from valproic acid, are not entirely produced.
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