Water → 2-Cyclopropylethyl methanesulfonate

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To a solution of 2-cyclopropylethanol (2.1 g, 24.4 mmol) in dichloromethane (50 ml) at 0° C. under nitrogen was added triethylamine (4.1 ml, 1.2 mol. equiv.). Methanesulphonyl chloride (2.5 ml, 1.3 mol. equiv.) was added, dropwise, and the reaction allowed to stir for 18 hours at room temperature. Water (50 ml) and dichloromethane (50 ml) were added. The organic phase was separated, washed with water (2×50 ml) and then dried over anhydrous sodium sulphate. The solution was filtered and the solvent removed from the filtrate by evaporation under reduced pressure to give the title compound as an oil (4 g). TLC Rf=0.9 (silica, methanol:dichloromethane, 1:19, by volume). LRMS m/z=182 (m+18)+.

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