Dimethyl Sulfoxide → 4-((Tert-butyldimethylsilyl)oxy)butanal

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To CH2Cl2 (150 mL) at −78° C. were added oxalyl chloride (6.83 g, 53.8 mmol) and dry DMSO (8.41 g, 108 mmol), dropwise. After 5 min, 4-(tert-butyldimethylsilyloxy)butan-1-ol (10 g, 48.9 mmol) in CH2Cl2 (5 mL) was added dropwise. The mixture was stirred for an additional 30 min at −78° C., and Et3N (24.8 g, 245 mmol) was added. The mixture was then allowed to warm to room temperature over 30 min. After stirring for 3 hrs, 100 mL of water was added. The phases were separated, and the aqueous phase was extracted three times with 100 mL of diethyl ether. The combined organic phases were washed successively with 50 mL of aqueous 1% HCl, 50 mL of water, 50 mL of aqueous 5% NaHCO3 and 50 mL of saturated aqueous NaCl. The organic layer was dried over MgSO4, and the solvent was removed under reduced pressure, to provide the title compound.

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