| 摘要 |
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 DEG to 230 DEG C. in a first stage, and, in a second stage, the residual reaction mixture is reacted with phosgene at 90 DEG -200 DEG 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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