New intermediates, process for their preparation, and their use for the synthesis of vitamins A and E
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United States of America Patent
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Nov 30, 1993
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N/A
app pub date -
Mar 27, 1992
filing date -
Dec 1, 1989
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Expired
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Abstract
New intermediates and processes for the preparation of vitamins A and E, which are the acetals of 5,6-dihalo-3-methyl-3-hydroxyhexanal or of 6-halo-3-hydroxy-3-methyl-5-hexenal or 3-methyl-3-hydroxy-5-hexenal, as well as processes for making the intermediates. After dehydrohalogenation and dehydration these intermediates are condensed directly with .beta.-ionone or with 2-methyl-2-heptene-6-one to synthesize vitamins A and E respectively.
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