[CH3:1][CH:2]([OH:6])[CH:3]([OH:5])[CH3:4].CCN(CC)CC.[CH3:14][S:15](Cl)(=[O:17])=[O:16]>C(Cl)Cl>[CH3:14][S:15]([O:5][CH:3]([CH:2]([O:6][S:15]([CH3:14])(=[O:17])=[O:16])[CH3:1])[CH3:4])(=[O:17])=[O:16]To a solution of butane 2,3-diol (15 g, 0.166 mol) and Et3N (57.7 mL, 0.415 mol) in CH2Cl2 (150 mL) at 0° C. was slowly added a solution of CH3SO2Cl (32.1 mL, 0.415 mol) in CH2Cl2 (75 mL). The mixture was stirred at 0° C. for 2 h and diluted with CH2Cl2. The mixture was washed with water, 1 N HCl, 5% aqueous NaHCO3 and brine. The organic layer was dried over MgSO4, filtered and concentrated under reduced pressure to afford butane-2,3-diyl dimethanesulfonate (40 g, 98%) as a light yellow oil. 1HNMR (CDCl3): δ4.9 (m, 2H, CH), 3.05 (s, 6H, CH3), 1.4 (m, 6H, CH3).
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