Method for the production of .gamma., .delta.-unsaturated ketones by reacting tertiary allyl alcohols with alkenyl alkyl ethers

US6034279A · kind A · utility

Assignee

• BASF SE

Inventors

• Stefan Käshammer · Schifferstadt, DE
• Detlef Ruff · Ludwigshafen, DE

Key dates

• Filing date: Jan 29, 1999
• Grant date: Mar 7, 2000
• Expiry date: Jan 29, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2601/14
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

An improved process is described for preparing .gamma.,.delta.-unsaturated ke-tones, which are in demand as aroma substances and intermediates for vitamins and carotenoids, by reacting tertiary allyl alcohols and alkenyl alkyl ethers in the presence of acid catalysts at elevated temperature, which comprises carrying out the reaction in the presence of a phosphorus derivative of the formula IV ##STR1## where A and B are each a branched or unbranched alkyl or alkoxy having from 1 to 10 carbons, a substituted or unsubstituted aryl, cycloalkyl, aryloxy or cycloaryloxy; PA0 A can additionally be --H or --OH or PA0 A and B together are a substituted or unsubstituted tetramethylene or pentamethylene or substituted or unsubstituted phenyl-1,2-diol or 1,1'-binaphthyl-2,2'-diol.