2-Chloroethanol → Bis(2-chloroethyl) P-(2-chloroethyl)phosphonate

Beteiligte Stoffe

Reaktionsschritte

Ethylene oxide, 816 g. (18.5 m) is added subsurface to a stirred solution of 824 g. (6.0 m) of phosphorus trichloride and 8.2 g. of 2-chloroethanol in 2.75 hr with cooling at 15°-20° C. The resulting reaction mixture consists of about 90% tris(2-chloroethyl) phosphite, the remainder being a mixture of phosphonates, is warmed to 80°, and 389 g. (5.4 m.) of acrylic acid containing 100 ppm of hydroquinone monomethyl ether is added in 1.2 hr with cooling at 80°-85°. The reaction mixture is warmed to 130° in 0.5 hr and kept at 130°-140° for 3.25 hr. Stripping to 165°/1 mm leaves 1881 g. of yellow liquid which is a mixture of 2-chloroethyl phosphonates, acidity 9.7 meq/100 g. Washing of a 622 g. portion with 5% sodium carbonate solution, followed by stripping at reduced pressure, gives 590 g. acidity 3.7 meq./100 g. Distillation of a portion of the washed material gives bis(2-chloroethyl) 2-chloroethylphosphonate, b.p. 148°-151°/0.5 mm., and 2-chloroethyl 3-[bis(2-chloroethoxy)phosphinyl]propionate, b.p. 189°-191°/0.1 mm, leaving a mixture containing higher molecular weight 2-chloroethyl phosphonates as undistilled residue.

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