Process for the manufacture of 3-hydroxy-2,6,6,-trimethyl-2 cycl

Details Process for the manufacture of 3-hydroxy-2,6,6,-trimethyl-2 cycl Process for the manufacture of 3-hydroxy-2,6,6,-trimethyl-2 cycl

1984-08-10

1985-07-30

Lone, Werren B.

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

Organic compounds

Oxygen containing

C07C 4568

Patent

active

045323585

ABSTRACT:
A process for the manufacture of 3-hydroxy-2,6,6,-trimethyl-2-cyclohexen-2-one, an intermediate in canthaxanthin synthesis, by isomerizing 1,1,3-trimethyl-7-oxabicyclo[4.1.0]heptan-2-one in the presence of a palladium(O) complex of an acetone derivative of the formula ##STR1## wherein R.sup.1 and R.sup.2 are aryl and R.sup.3 and R.sup.4 are hydrogen or monovalent hydrocarbon groups optionally carrying a carbonyl function, a bis-(diphenylphosphino) derivative of the formula

REFERENCES:
patent: 4359586 (1982-11-01), Ho et al.
patent: 4371711 (1983-02-01), Saito et al.
Suzuki et al., "J. Amer. Chem. Soc.", vol. 102, pp. 2095-2096, (1980).

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