Process for the preparation of vinylphosphonic dichloride

Details Process for the preparation of vinylphosphonic dichloride Process for the preparation of vinylphosphonic dichloride

C - Chemistry, Metallurgy

07

F

260/537.8

C07F 9/42 (2006.01)

Patent

CA 1311249

- 1 - ABSTRACT OF THE DISCLOSURE HOE 86/F 223 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 tem- perature of 130 to 166°C and the vinylphosphonic dichlor- ide produced is simultaneously removed by distillation under reduced pressure. When the other catalysts are used, the process can be carried out at atmospheric pres- sure or reduced pressure and at temperatures of about 130 to 220°C and the vinylphosphonic dichloride produced can be removed by distillation simultaneously with or subsequent to the reaction.

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