Solketal → (2,2-Dimethyl-1,3-dioxolan-4-yl)methyl methanesulfonate

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To a solution of (2,2-dimethyl-[1,3]dioxolan-4-yl)-methanol (1.25 g, 9.46 mmol) and triethylamine (9.2 ml, 66.2 mmol) in dichloromethane (60 ml) at 0° C. was slowly added methanesulfonyl chloride (2.2 ml, 28.4 mmol). The reaction mixture was stirred at 0° C. for 2 h then quenched with water and the aqueous layer was extracted with dichloromethane. The combined organics were washed with 10% citric acid, sat NaHCO3, and brine then dried over MgSO4 and concentrated to afford methanesulfonic acid 2,2-dimethyl-[1,3]dioxolan-4-ylmethyl ester as a light brown oil which was used without further purification.

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