Process for preparing compounds having a 1,5-dimethyl-hexa-1,5-d

Details Process for preparing compounds having a 1,5-dimethyl-hexa-1,5-d Process for preparing compounds having a 1,5-dimethyl-hexa-1,5-d

1982-02-04

1984-10-02

Brust, Joseph Paul

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

Organic compounds

Carboxylic acid esters

568447, 568591, 568668, 568824, C07C17500

Patent

active

044749830

ABSTRACT:
1,5-Dimethyl-hexa-1,5-dienylene compounds, and especially Vitamin A and derivatives thereof, are made by desuphonylating with a basic reagent a sulphone of the formula: ##STR1## in which the sulphonyl group --SO.sub.2 R replaces a hydrogen atom on carbon atom (a) or (b), R represents a phenyl or napthyl group, A is 2-(2,6,6-trimethylcyclohex-1-enyl)ethenyl, and Q is --CH.sub.2 OH or an ether or ester thereof, CHO, or an acetal group.

REFERENCES:
patent: 4087464 (1978-05-01), Decor
patent: 4147708 (1979-04-01), Manchand
patent: 4175205 (1979-11-01), Decor
patent: 4331814 (1982-05-01), Chabardes et al.
Buehler et al., "Survey of Organic Synthesis", (1970), John Wiley & Sons, Inc., pp. 93-94.

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