Dihydropyran derivatives, processes for preparation and use
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United States of America Patent
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Oct 5, 1993
Issued Date -
N/A
app pub date -
May 7, 1992
filing date -
Dec 1, 1989
priority date (Note) -
Expired
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Abstract
The present invention relates to dihydropyran derivatives, processes for preparing, and processes of using the derivatives. The derivatives are prepared by condensation of lithium dienolate of prenal with an aldehyde or a ketone. The pyran derivative prepared from .beta.-ionylideneacetaldehyde when treated in the presence of a catalyst directly forms retinal.
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