Sodium ethoxide → Diethyl 2-hydroxyethoxymethanephosphonate

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To a solution of diethyl 2-acetoxyethoxymethylphosphonate* (16 g, 63 mmol) in absolute ethanol (150 ml), was added 0.5M sodium ethoxide (12.19 ml). After standing at ambient temperature overnight, 1R-120H resin was added until pH 6.5 was reached. The solution was filtered immediately, the resin washed with ethanol and the combined filtrates evaporated under reduced pressure. The residue was chromatographed on silica gel (eluted with chloroform: methanol, 98:2) to yield the title compound as a colourless oil (9.3g, 70%). IR: νmax (film) 3420, 3000, 1450, 1395, 1240, 1170, 1130, 1030, 970 cm-1. 1H NMR: δH (CDCl3) 1.35 (6H,t,J=7Hz, (OCH2CH3)2), 3.75 (4H,br.s, OCH2CH2O), 3.90 (2H,d,J=8Hz, O--CH2P), 4.20 (4H,m,(O--CH2CH3)2), 5.20 (1H,br.s, D 2 O exchangeable, OH). Found: C,38.64; H,8.27%. C7H17PO5.0.3H2O requires: C,38.63; H,8.01%.

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