Synthesis of Dichloromethylphosphonates

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• O-Ethyl-N,N-dimethyl trichloromethylphosphonoamidate (1f) was obtained by refluxing (C2H5O)2PN(CH3)2 in carbon tetrachloride. Yield: 72%, b.p. 130°C/10 mm Hg. 1H NMR (CDCl3): δ = 1.31 (t, 3 J HH = 7 Hz, 3H), 2.88 (d, 3 J PH = 8.5 Hz, 6H), 4.25 (m, 3 J HH = 7 Hz, 3 J PH = 7 Hz, 2H). 31P{1H} NMR (CDCl3): δ = 12.3. Anal. Calcd. for C5H11Cl3NOP: C 23.60, H 4.35. Found C 23.41, H 4.21%
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