Catalytic Preparation of Cyclic Carboxylic Esters
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United States of America Patent
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Issued Date -
Nov 5, 2009
app pub date -
Apr 7, 2006
filing date -
Apr 8, 2005
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Abandoned
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Abstract
Preparation of cyclic esters by hydrogenation of a carbonyl group in at least one anhydride radical —C(O)—O—C(O)— of a cyclic dicarboxylic or polycarboxylic anhydride by means of hydrogen in the presence of a homogeneous noble metal catalyst, characterized in that the hydrogenation is carried out in a homogeneous reaction mixture using an iridium catalyst. The cyclic esters are obtained in good chemical and optical yields when prochiral anhydrides are used together with chiral iridium catalysts.
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