Ketocarboxylic acids, ketocarboxylic esters, methods of manufacture and uses thereof
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United States of America Patent
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Dec 29, 2015
Grant Date -
Nov 7, 2013
app pub date -
Jul 3, 2013
filing date -
Nov 11, 2010
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Abstract
Ketocarboxylic acids such as levulinic acid can be efficiently purified in high yield by esterification with a hydrocarbon polyol to the corresponding polyketocarboxylic ester, which can be readily purified, for example recrystallized. After purification, the ketocarboxylic ester can be hydrolyzed to provide pure ketocarboxylic acid, or a salt thereof, after removal of the esterifying hydrocarbon polyol, or used for other synthetic transformations. Advantageously, the polyketocarboxylic esters, ketocarboxylic acids, and salts thereof produced by this method are obtained in high purity.
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