Intermediates for preparing vitamins A and E and carotenoids

Details Intermediates for preparing vitamins A and E and carotenoids Intermediates for preparing vitamins A and E and carotenoids

1992-11-27

1995-09-12

Richter, Johann

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

Organic compounds

Oxygen containing

568378, 568403, 568404, C07C 4300

Patent

active

054498449

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.

REFERENCES:
patent: 2482725 (1946-12-01), Bramwyche et al.
patent: 2667517 (1951-06-01), Longley
patent: 4331814 (1982-05-01), Chabardes et al.
G. Saucy and R. Marbet, Uber eine neuartige Synthese von .beta.-Ketoallenen durch Reaktion von Tertiaren Acetylencarbinolen mit Vinylathern Eine ergiebige Methode zur Darstellung des Pseudojonons und verwandter Verbingungen, 50:1158-1167 (1967).

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