Process for the preparation of unsaturated 4,5-allene ketones, 3,5-diene ketones and the corresponding saturated ketones

US6380437B1 · kind B1 · utility

Assignee

• Degussa AG · DE

Inventors

• Nongyuan Shi · Hanau, DE
• Frank Hubner · Ober-Ramstadt, DE
• Bernd Drapal · Alzenau, DE
• Rainer Peter · Hösbach, DE
• Steffen Krill · Mühltal, DE
• Klaus Huthmacher · Gelnhausen, DE
• Christoph Weckenbecker · Gelnhausen, DE

Key dates

• Filing date: Oct 11, 2000
• Grant date: Apr 30, 2002
• Expiry date: Oct 11, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C45/515
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Process for the preparation of unsaturated 4,5-allene ketones by reaction of tertiary propargyl alcohols with alkenyl alkyl ethers or ketals in the presence of aliphatic sulfonic acids or sulfonic acid salts.