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

1994-10-07

1996-10-22

Reamer, James H.

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

Organic compounds

Oxygen containing

568447, 560128, C07C 4921

Patent

active

055678521

ABSTRACT:
The present invention relates to novel intermediates for the preparation of vitamin A and carotenoids corresponding to the formula (II): ##STR1## in which A represents a hydrogen or an alkyl, alkenyl or alkoxy group containing 1 to 4 carbon atoms, and X represents a carbon atom, and to a process for their preparation and their use, and further relates to compounds for preparing intermediates of formula (II) corresponding to the formula (III): ##STR2## in which R represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkylcarbonyl, alkenylcarbonyl, alkoxyalkyl or alkoxyalkenyl group in which the alkyl groups have 1 to 10 carbon atoms and the alkenyl groups have 2 to 10 carbon atoms, each of said groups being linear or branched and each being substituted or unsubstituted.

REFERENCES:
patent: 3632860 (1972-01-01), Marbet

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