Process for the preparation of ketals

US5399778A · kind A · utility

Assignee

• Huls Aktiengesellschaft · DE

Inventors

• Klaus-Dieter Steffen · Hennef (Sieg), DE
• Josef Metz · Neuss, DE

Key dates

• Filing date: Oct 19, 1993
• Grant date: Mar 21, 1995
• Expiry date: Oct 19, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C41/58
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Ketals of longer-chain or branched alcohols are prepared from dimethyl ketals or their ketones by reaction of the dimethyl ketals and the alcohols at high temperatures of 150.degree. to 180.degree. C. in the presence of acid catalysts. The enol ethers and mixed ketals which are separated by distillation are added to the next reaction batch and also react to form the target product. The starting material, dimethyl ketal, may also be formed during the reaction from the ketone and trimethyl orthoformate.