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Di-(2-chloroethyl)amidophosphorodichloridate is prepared according to H. Brintzinger et al in Chemische Berichte 82, 389-99 (1949) from bis-(2-chloroethyl)amine hydrochloride and phosphoryl chloride in the presence of pyridine. 0.03 mol (7.8 g) of this material is dissolved in 100 ml of acetone and added to an acetone solution of 0.03 mole (6.3 g) of 2-cyanovinyl 4-aminophenyl sulfone. To the stirred mixture is added in 2-3 portions a 10% solution of 1,4-diazabicyclo[2.2.2.]octane in acetone. After a few minutes a yellow slurry forms which is stirred at room temperature for 30 minutes. After filtration to remove the amine hydrochlorides the filtrate is reduced to about half its volume by evaporation and then mixed with chloroform, washed with water and worked up. The light yellow solid is di-(2-chloroethyl)amido-di-4-(2-cyanoethenesulfonylanilido)phosphine oxide: ##SPC57##

1. filtrationAfter filtration
2. customto remove the amine hydrochlorides the filtrate
3. customis reduced to about half its volume by evaporation
4. additionmixed with chloroform
5. washwashed with water