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 1304405

HOE 86/F 224 ABSTRACT OF THE DISCLOSURE The invention relates to a process for the preparation of vinylphosphonic dichloride, in which a 2-chloroethane- phosphonate of the formula Image or Image or a mixture of the two esters, is reacted with thionyl chloride at a temperature of 60 to 160°C in the presence of a catalyst which contains tertiary phosphines, quaternary ammonium or phosphonium salts or alkali metal or alkaline- earth metal halides. During this reaction, any thionyl chloride which may be present is removed by distillation subsequent to this re- action, the mixture remaining is heated to 140 to 200°C, and the vinylphosphonic dichloride produced during this is removed by distillation.

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