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5.6 g (0.2 mole) ethylene, 23.6 g (0.1 mole) trichloromethane phosphonic dichloride, 162 mg (1 mmole) anhydrous ferric chloride and 366 mg (1 mmole) dibenzpinacol were heated in a 100 ml silver-lined autoclave in 40 ml dry methylene chloride at 120° during 14 hours. During this time the pressure fell from 500 to 220 psi. After cooling, the reaction product was extracted three times with ice-cold 1N aqueous hydrochloric acid after take-up in methylene chloride and dried on calcium chloride. Evaporation at atmospheric pressure at 50° left an oil which was distilled in vacuo, yielding 13.7 g 1,1,3-trichloropropane-1-phosphonic dichloride, bp/4: 105°-106°. Quantitative half-hydrolysis gave 13.4% chloride ion. Calc.: 13.4%.

1. temperatureAfter cooling
2. extractionthe reaction product was extracted three times with ice-cold 1N aqueous hydrochloric acid
3. customdried on calcium chloride
4. customEvaporation at atmospheric pressure at 50°
5. waitleft an oil which
6. distillationwas distilled in vacuo