Preparation of polyenecarbonyl compounds having a high content of the all-E isomer, and of their acetals or ketals

US5773635A · kind A · utility

Assignee

• BASF SE

Inventors

• Walter Dobler · Schwetzingen, DE
• Wolfgang Krause · Münstermaifeld, DE
• Joachim Paust · Schifferstadt, DE
• Otto Worz · Friedelsheim, DE
• Udo Rheude · Otterstadt, DE
• Wolfram Burst · Mannheim, DE
• Gunter Dauwel · Lustadt, DE
• Armin Bertram · Bischofswerda, DE
• Bernhard Schulz · Schwetzingen, DE
• Günter Wegner · Charlotte, US
• Peter Munster · Römerberg, DE
• Hansgeorg Ernst · Speyer, DE
• Arno Kochner · Waldsee, DE
• Heinz Etzrodt · Neustadt, DE

Key dates

• Filing date: Jul 6, 1995
• Grant date: Jun 30, 1998
• Expiry date: Jul 6, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2601/16
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing polyenecarbonyl compounds having a high all-E content and their acetals or ketals by aldol condensation or Horner-Emmons reaction comprises carrying out the reaction, for the purposes of the preferred formation of a double bond of E configuration and in order to maintain the E configuration of the double bonds in the stating compounds as completely as possible, in the presence of oxygen or an oxygen-inert gas mixture or nitric oxide or a nitric oxide-inert gas mixture and/or in the presence of specific stable radicals and/or in the presence of quinones or quinone derivatives.