Process for the preparation of 2-chloroethanephosphonic dichloride

US4749524A · 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: Jun 7, 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 2-chloroethanephosphonic dichloride through reaction of a 2-chloroethanephosphonate of the formula ##STR1## or a mixture of the two esters, with thionyl chloride at a temperature of 60.degree. to 160.degree. C. In this reaction, tertiary phosphines, quaternary ammonium or phosphonium salts or alkali metal or alkaline-earth metal halides are employed as catalysts. The thionyl chloride is introduced into the initially introduced ester.