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From 10.3 g (85 mmole) of trimethylphosphite and 13.5 g (60 mmole) of 3,4-dichlorophenyl chloroformate (100°, 2 hours). Yield 11.4 g (64%) B.p.0.04 154° C. nD20 1.5271. Solidifies to colourless crystals m.p. 58°-9° C. Analysis for C9H9Cl2O5P. Found (calculated): C 36.06 (36.14), H 3.31 (3.03), Cl 23.58 (23.71), P 10.50 (10.36). NMR (CDCl3)δ: 3.93 and 4.07 (CH3O), 7.0-7.6 (C6H3) IR (KBr)cm-1 : 1740 (CO), 1205, 1200, 1105, 1055, 1020.