Intermediates for preparing vitamins A and E and carotenoids
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United States of America Patent
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Sep 12, 1995
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N/A
app pub date -
Nov 27, 1992
filing date -
Nov 28, 1991
priority date (Note) -
Expired
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Abstract
The present invention relates to a new method of condensing polyenic compounds wherein a compound having the formula III ##STR1## is condensed with a compound having the formula IV ##STR2## under the influence of a Lewis acid or a protic acid. R.sub.1 through R.sub.7 represent alkyl or alkenyl groups, A' is preferably chlorine, B is preferably a hydroxyl group, and n' is 0 to 10. The invention also relates to novel intermediates for use in the preparation of Vitamins A and E produced by means of the new method.
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