Patent · US Expired

Process for making vitamin E using hydrogen-tris(oxalato) phosphate

US6700002B2 · kind B2 · utility

1Cited by

2References

22Claims

0Family size

Assignee

Roche Vitamins Inc. · US

Inventors

Werner Bonrath · Kaiseraugst, CH
Thomas Netscher · Bad Krozingen, DE
Ulrich Wietelmann · Friedrichsdorf, DE

Key dates

Filing date	Jan 17, 2002
Grant date	Mar 2, 2004
Priority date	—
Expiry date	Jan 17, 2022

Classification

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

Abstract

A process for the manufacture of (all-rac)-&agr;-tocopherol by the catalyzed reaction of trimethylhydroquinone with isophytol or phytol is characterized by carrying out the reaction in the presence of hydrogen tris(oxalato)phosphate, or an adduct thereof with a solvent, as the catalyst in an organic solvent. The product of the process is the most active and industrially most important member of the vitamin E group.

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