Patent · US Expired

Preparation of astaxanthin novel intermediates therefor and the preparation thereof

US5455362A · kind A · utility

15Cited by

4References

2Claims

0Family size

Assignee

BASF SE

Inventors

Hansgeorg Ernst · Speyer, DE
Walter Dobler · Schwetzingen, DE
Joachim Paust · Schifferstadt, DE
Udo Rheude · Otterstadt, DE

Key dates

Filing date	Jun 27, 1994
Grant date	Oct 3, 1995
Priority date	—
Expiry date	Jun 27, 2014

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P20/55
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Compounds of the formula I ##STR1## where R.sup.1 is H or C.sub.1 -C.sub.4 -alkyl, PA0 R.sup.2 is C.sub.1 -C.sub.4 -alkyl and R.sup.3 is an ether, silyl ether or acetal protective group which can be converted into a hydroxyl group by hydrolysis, in particular one of the radicals ##STR2## and a process for preparing these compounds by reacting an alkenyne of the formula II ##STR3## in an inert solvent in the presence of lithium amide with a cyclohexenone of the formula III ##STR4## and the use of the compounds of the formula I for preparing astaxanthin, are described.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.