Process for the preparation of vinylphosphonic dichloride

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

1987-08-27

1988-08-02

Killos, Paul J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2605024R, C07F 942

Patent

active

047612525

ABSTRACT:
The invention relates to a process for the preparation of vinylphosphonic dichloride, in which a 2-chloroethanephosphonate of the formula ##STR1## or a mixture of the two esters, is reacted with thionyl chloride at a temperature of 60.degree. to 160.degree. 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 reaction, the mixture remaining is heated to 140.degree. to 200.degree. C., and the vinylphosphonic dichloride produced during this is removed by distillation.

REFERENCES:
patent: 4548762 (1985-10-01), Kleiner

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