Processes for the preparation of macrocyclic ketones
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United States of America Patent
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Mar 1, 2005
Grant Date -
Apr 24, 2003
app pub date -
Sep 19, 2002
filing date -
Apr 4, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed are a process of subjecting a diester of a long-chain dicarboxylic acid having 18 to 21 carbon atoms to intramolecular condensation in the presence of titanium tetrachloride or zirconium tetrachloride and a trialkylamine to form an .alpha.-alkoxycarbonylated macrocyclic ketone, and a process for producing a macrocyclic ketone by hydrolyzing an .alpha.-alkoxycarbonylated macrocyclic ketone obtained by the process and then subjecting the hydrolyzate to decarboxylation. The invention provides a process for producing a macrocyclic ketone efficiently, which permits high concentration synthesis.
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