US 4,283,559 A · Process for the manufacture of cyclohexene derivatives

Abstract

The compound 6-hydroxy-3-(5-hydroxy-3-methyl-1,3-pentadienyl)-2,4,4-trimethyl-2-cyclohe xen-1-one useful as intermediate for producing the natural coloring agent astaxanthin as well as a method for synthesizing astaxanthin from this compound and synthesizing the compound from 2-hydroxyketo isophorone.

Claims2

Dependent claims

A phosphonium salt of the general formula ##STR14## wherein X is aryl;

and Y is halogen.

Dependencies are inferred from the claim text.

Facts

Application

06/040,625Filed 21 May 1979

Priority

CH 6074/782 Jun 1978

Granted

11 Aug 1981

Term ends

Not estimatedThe source records don’t support an estimate.

Classification17 codes

C07C 403/24
Derivatives of cyclohexane or of a cyclohexene or of cyclohexadiene, having a side-chain containing an acyclic unsaturated part of at least four…:…
C07C 45/64
By reactions not involving the formation of >C = O groups: by introduction of functional groups containing oxygen only in singly bound form
C07C 49/713
Containing hydroxy groups: a keto group being part of a six-membered ring
C07C 49/753
Unsaturated compounds containing a keto groups being part of a ring: containing ether groups, [IMAGE cpc-sch-C07C-0958.gif] groups,[IMAGE…

Process for the manufacture of cyclohexene derivatives

Life of this patent

Abstract

Claims2

Process for the manufacture of cyclohexene derivatives

Life of this patent

Abstract

Claims2