Dihydropyran derivatives, processes for preparation and use

Details Dihydropyran derivatives, processes for preparation and use Dihydropyran derivatives, processes for preparation and use

1992-05-07

1993-10-05

Hollrah, Glennon H.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

568447, 568463, 568496, C07D31500

Patent

active

052507106

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.

REFERENCES:
patent: 3159653 (1964-12-01), Falbe et al.
patent: 3655695 (1972-04-01), Andrews
Carey, Francis Organic Chemistry McGraw Hill Book Co., N.Y., p. 560 (1987).

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