Process for preparing cyclopropyl alkyl ketones and 4,5-dihydroalkylfurans

US5629455A · kind A · utility

Assignee

• Huels Aktiengesellschaft · DE

Inventors

• Manfred Kaufhold · Marl, DE
• Marcel Feld · Cologne, DE

Key dates

• Filing date: Jan 23, 1996
• Grant date: May 13, 1997
• Expiry date: Jan 23, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C45/676
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a novel process for the simultaneous preparation of cyclopropyl alkyl ketones and 4,5-dihydroalkylfurans from 3-acyltetrahydrofuran-2-ones using a metal salt according to the diagram ##STR1## In the reaction, N-alkyllactams and/or N-acylmorpholines which are high-boiling and only slightly miscible with water are used. By charging the solvent, the metal salt and the 3-acyltetrahydrofuran-2-one in a molar excess with respect to the metal salt, heating the mixture to 160.degree. to 220.degree. C. and metering in further 3-acyl-tetrahydrofuran-2-one, the desired products are obtained in high yields. The metal salt can moreover be recovered in a simple manner by washing with water.