Patent · US Expired

Preparation of d-.alpha.-tocopherol from natural intermediates

US4925960A · kind A · utility

3Cited by

5References

7Claims

0Family size

Assignee

BASF SE

Inventors

Peter Lechtken · Bischofswerda, DE
Ulrich Hoercher · Mannheim, DE
Barbara Jessel · Ludwigshafen, DE

Key dates

Filing date	Apr 13, 1989
Grant date	May 15, 1990
Priority date	—
Expiry date	Apr 13, 2009

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D311/72
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

d-.alpha.-Tocopherol is prepared from a mixture obtained from natural intermediates and containing .alpha.-, .beta.-, .gamma.- and .delta.-tocopherols, by methylation at the aromatic ring of the tocopherols by reaction with formaldehyde or with a compound which donates formaldehyde under the reaction conditions, and subsequent catalytic hydrogenation, by a process in which the reaction with formaldehyde or with the formaldehyde donor is carried out at from 150.degree. to 200.degree. C. in the presence of an alkyl ester of phosphoric or phosphorous acid.

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