Preparation of acrylic acid derivatives from α- or β-hydroxy carboxylic acids
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United States of America Patent
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May 26, 2009
Grant Date -
Oct 6, 2005
app pub date -
Mar 30, 2005
filing date -
Apr 2, 2004
priority date (Note) -
Expired
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Abstract
The invention is directed to a process for the preparation of α,β-unsaturated acids, esters and amides from α- or β-hydroxycarboxylic acids or esters or precursors in high yields and high selectivity. The α,β-unsaturated acids or esters are optionally prepared in the presence of specific dehydration and/or esterification catalysts. The α,β-unsaturated amides or substituted amides are prepared optionally in the presence of a dehydration and/or amidation catalyst. The source of α- or β-hydroxycarboxylic acids or precusor is preferably from a renewable resource. The precursor is defined herein.
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