Process for the preparation of vinylphosphonic acid dichloride and 2-chloroethanephosphonic acid dichloride

US4548762A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Hans-Jerg Kleiner · Kronberg, DE
• Walter Dursch · Königstein, DE

Key dates

• Filing date: Feb 4, 1983
• Grant date: Oct 22, 1985
• Expiry date: Feb 4, 2003

Classification

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

Abstract

A process for the preparation of vinylphosphonic acid dichloride and 2-chloroethanephosphonic acid dichloride, wherein 2-chloroethanephosphonic acid derivatives containing 2-chloroethyl ester groups, as produced in the Arbusow rearrangement of tris-chloroethyl phosphite, are heated to 150.degree. to 230.degree. C. in a first stage, and, in a second stage, the residual reaction mixture is reacted with phosgene at 90.degree.-200.degree. C., in the presence of basic catalysts or of alkali metal salts as catalysts, and in the presence of phosphonic acid dichlorides.