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Me3SiBr (0.812 mL, 6.15 mmol) was added to a solution of dimethyl octadecyloxycarbonylphosphonate (1.0 g, 2.46 mmol) in CH2Cl2 (20 mL) under argon, and the yellow solution was stirred at room temperature for 4 hours and evaporated under reduced pressure. Trituration of the oily residue with hexane, followed by filtration and drying afforded a hygroscopic white solid of the title compound (0.757 g, 81%); mp 81-82° C.; IR (KBr): υ 2960, 2920, 2860, 1730, 1720, 1475, 1465, 1265, 1240, 1225 cm−1; 1H NMR (CDCl3+CD3OD) δ0.8-1.8 (m, 35H, CH3 (CH2)16), 4.25 (t, 2H, OCH2). Anal. Calcd. for C19H39O5P.0.3H2O : C, 59.43; H, 10.42; P, 8.07. Found: C, 59.77; H, 10.91; P, 8.21.

1. customevaporated under reduced pressure
2. filtrationTrituration of the oily residue with hexane, followed by filtration
3. customdrying