Process for making intermediates for fragrance components from .alpha.-campholenic aldehyde
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United States of America Patent
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Aug 28, 2007
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N/A
app pub date -
Nov 27, 2006
filing date -
Nov 27, 2006
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Expired
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Abstract
A two-step aldol condensation process is disclosed. .alpha.-Campholenic aldehyde (ACA) and methyl ethyl ketone (MEK) react in the presence of a base under conditions effective to produce a mixture comprising a high yield of ketol condensation products. Dehydration of the ketols in the presence of an organic sulfonic acid provides unsaturated ketones that are valuable intermediates for fragrance components for synthetic sandalwood products. Compared with the usual one-step, base-catalyzed approach, the two-step process increases the yield of all condensation products and maximizes production of the most valuable ketone isomers.
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