Patent · US Expired

Cyclohexene carotinoid intermediates

US4233464A · kind A · utility

4Cited by

4References

3Claims

0Family size

Assignee

BASF SE

Inventors

Manfred Baumann · Diepoldsau, CH
Werner Hoffmann · Ludwigshafen, DE

Key dates

Filing date	Apr 12, 1978
Grant date	Nov 11, 1980
Priority date	—
Expiry date	Apr 12, 1998

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C2601/16
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

1-[3-Methyl-3,5,5-trialkoxy-pent-1-yn-1-yl]-2,6-dimethyl-cyclohex-1-enes, which may or may not be methyl-substituted in the 2- and/or 6-position, are obtained by reacting the corresponding 1-[3-methyl-but-1-yn-3-en-1-yl]-2,6-dimethyl-cyclohex-1-enes with orthoformic acid esters in the presence of acid condensing agents. The new compounds provide a new method of access to the compounds of carotinoid chemistry, especially to vitamin A, which avoids the conventional expensive synthesis via phosphorus ylide compounds.

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