Process for producing cycloalkenylalkenes

Details Process for producing cycloalkenylalkenes Process for producing cycloalkenylalkenes

1991-03-25

1992-10-13

Dees, Jose G.

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

Organic compounds

Carboxylic acid esters

560105, C07C40312

Patent

active

051552558

ABSTRACT:
A process for the manufacture of certain cycloalkenylalkenes, e.g. vitamin A acetate, comprises dehydrating 1-(5-acetoxy-3-methyl-penta-1,3-dienyl)-2,6,6-trimethyl-cyclo hexanol or 4 aetoxy-1-(5-acetoxy-3-methyl-penta-1,3-dienyl)-2,6,6-trimethyl-cyclohexano l or 1-(9-acetoxy-3,7-dimethyl-4-hydroxy-nona-2,5,7-trienyl)-2,6,6-trimethyl- cyclohexene in the presence of an alkali metal bromide or of manganese bromide or of a hydrate of such a bromide as the catalyst and in an organic solvent.
The products are especially suitable as intermediates in carotinoid syntheses.

REFERENCES:
Isler et al., Helv.Chim. Acta., 32:489-499 (1949).
Isler et al., Helv.Chim. Acta., 39:249-259 (1956).
Isler et al., Helv.Chim. Acta., 51:447-462 (1979).

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