反应详情

298 g of the vinylphosphonic acid derivatives thus prepared are metered into 300 g of vinylphosphonic acid dichloride at 145° C. during the course of 4 hours, whilst stirring, during which time phosgene gas is continuously introduced into the reaction mixture. The reaction mixture is then further phosgenated for 10 hours at this temperature. 1,2-Dichloroethane which is formed distils off during the phosgenation. After the phosgenation has ended, the excess phosgene is stripped off at room temperature in the vacuum from a water jet. The mixture is then distilled at 2 mm Hg with the aid of a column. 430 g of vinylphosphonic acid dichloride and 140 g of 2-chloroethanephosphonic acid dichloride are obtained. The distillation residue is 39 g. 130 g of vinylphosphonic acid dichloride and 140 g of 2-chloroethanephosphonic acid dichloride were thus prepared from 298 g of vinylphosphonic acid derivatives. The 2-chloroethanephosphonic acid dichloride can again be employed as the reaction medium in a second mixture, instead of the vinylphosphonic acid dichloride.

1. additionis continuously introduced into the reaction mixture
2. customdistils off during the phosgenation
3. customis stripped off at room temperature in the vacuum from a water jet
4. distillationThe mixture is then distilled at 2 mm Hg with the aid of a column