Process to produce .alpha.-tocopherol-acetate

US6239294A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Steffen Krill · Mühltal, DE
• Stephan Kretz · Bad Orb, DE
• Klaus Huthmacher · Gelnhausen, DE

Key dates

• Filing date: May 15, 2000
• Grant date: May 29, 2001
• Expiry date: May 15, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/584
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Process for the production of .alpha.-tocopherol acetate in a recycling process by condensation of trimethylhydroquinone diesters and isophytol in the presence of a catalyst system consisting of a zinc halide and of an aqueous protonic acid and optionally of an elemental metal in a polar solvent/water mixture which is extractable or miscible with water and subsequent recycling of the catalyst system.