Process for producing vitamin A or its carboxylic acid esters, a

Details Process for producing vitamin A or its carboxylic acid esters, a Process for producing vitamin A or its carboxylic acid esters, a

1988-07-05

1989-10-24

Lone, Werren B.

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

Organic compounds

Oxygen containing

C07C 3518

Patent

active

048764000

ABSTRACT:
A process for producing vitamin A represented by the formula ##STR1## which comprises treating a compound represented by the formula ##STR2## wherein R.sup.1 represents an aryl group which may be substituted, R.sup.21 and R.sup.22 each represent a hydrogen atom or a lower alkanoyl group, R.sup.3 represents an acetal-type protective group for a hydroxyl group, and X represents a halogen atom, with a base; and novel intermediate compounds useful for the above process.

REFERENCES:
patent: 3848000 (1974-11-01), Chabardes et al.
patent: 3979471 (1976-11-01), Julia
patent: 4175205 (1979-11-01), Decor
Mandai et al., "Novel Synthesis of Acteylenes and Polyenes via Desulfonylation reaction", J. Amer. Chem. Soc.--vol. 106 (1984), pp. 3670-3672.

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