Process for the preparation of vinylphosphonic acid...

Details Process for the preparation of vinylphosphonic acid... Process for the preparation of vinylphosphonic acid...

C - Chemistry, Metallurgy

07

F

260/537.8

C07F 9/42 (2006.01) C07F 9/40 (2006.01)

Patent

CA 1170668

HOE 80/F 193 Abstract of the disclosure: 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-chloro- ethyl phosphite, are heated to 150 to 230°C in a 1st stage, and, in a second stage, the residual reaction mixture is reacted with phosgene at 90 - 200°C, in the presence of basic catalysts or of alkali metal salts as catalysts, and in the presence of phosphonic acid dichlorides.

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