Triethylamine → Methanesulfonic acid 2-benzyloxy-1-trityloxymethylethyl ester

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To a solution of 1-benzyl-3-tritylglycerol (17.5 g, 0.41 mol) in anhydrous dichloromethane (200 mL) at 0° C. was added triethylamine (8 mL, 0.58 mol) followed by methanesulfonyl chloride (4.1 mL, 0.54 mol). The reaction was stirred at 0° C. for 1 hour, then at room temperature for 2 hours. The reaction mixture was washed with 1N hydrochloric acid (30 mL), dried (Na2SO4), filtered and concentrated. Crystallisation using diisopropyl ether gave the title compound (15.2 g, 72%) as a solid. m/z not found, r.t.=4.41 mins. NMR (400 MHz; CDCl3) δ7.43-7.41 (6H, m), 7.38-7.23 (14H, m), 4.90-4.83 (1H, m), 4.52 (2H, m), 3.75-3.63 (2H, m), 3.41-3.33 (2H, m), 3.02 (3H, s).

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