Process for the preparation of vinylphosphonic dichloride

US4761251A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Herbert Siegel · Hofheim, DE
• Erwin Weiss · Hofheim, DE
• Harald Berger · Kelkheim, DE

Key dates

• Filing date: Aug 27, 1987
• Grant date: Aug 2, 1988
• Expiry date: Aug 27, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/42
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the preparation of vinylphosphonic dichloride through elimination of hydrogen chloride from 2-chloroethanephosphonic dichloride in the presence of catalysts. The catalysts used are tertiary phosphines, quaternary ammonium or phosphonium salts or alkali metal or alkaline-earth metal halides. When triphenyl phosphine is used as the catalyst, the reaction is carried out under reduced pressure at a temperature of 130.degree. to 166.degree. C. and the vinylphosphonic dichloride produced is simultaneously removed by distillation under reduced pressure. When the other catalysts are used, the process can be carried out at atmospheric pressure or reduced pressure and at temperatures of about 130.degree. to 220.degree. C. and the vinylphosphonic dichloride produced can be removed by distillation simultaneously with or subsequent to the reaction.