Intermediates for the preparation of vitamin A and carotenoids a

Details Intermediates for the preparation of vitamin A and carotenoids a Intermediates for the preparation of vitamin A and carotenoids a

1995-06-07

1997-06-17

Reamer, James H.

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

Organic compounds

Oxygen containing

568447, 568448, 568425, 568490, C07C 4711

Patent

active

056399197

ABSTRACT:
The present invention relates to novel intermediates for the preparation of vitamin A and carotenoids, corresponding to the following formula (I): ##STR1## in which X is a carbon atom; n is equal to 1 or 2; R.sub.1, R.sub.2 and R.sub.3, which may be identical or different, each independently represent hydrogen, alkyl containing 1 to 4 carbon atoms, alkenyl containing 2 to 11 carbon atoms or aryl, each alkyl and alkenyl may be linear, branched or cyclic, or R.sub.1 and R.sub.2 can together with the carbon atom to which they are attached form a cycloaliphatic compound which is optionally substituted; and R.sub.4, R.sub.5, R.sub.6, R.sub.7 and R.sub.8, which may be identical or different, each independently represent hydrogen, alkyl containing 1 to 4 carbon atoms or alkenyl containing 2 to 10 carbon atoms, each alkyl or alkenyl being linear, or if containing sufficient numbers of carbon atoms, may also be branched or cyclic, or an aryl containing 6 to 10 carbon atoms, or any two of R.sub.4, R.sub.5, R.sub.6, R.sub.7 and R.sub.8 may together form, along with the carbon atom(s) to which they are attached, a cycloalkylidene group containing 3 to 10 carbon atoms, as well as the process for their preparation and their use.

REFERENCES:
patent: 3057888 (1962-10-01), Marbet et al.
patent: 3225102 (1965-12-01), Thompson
Chemical Abstracts, vol. 103, No. 15, Oct. 14, 1985, Columbus, Ohio, US; abstract No. 123059d, "Alpha-Beta-Unsaturated Carbonyl Compound."

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