Sec-Butylbenzene → 4-(Butan-2-yl)benzene-1-sulfonyl chloride

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To a solution of commercially available sec-butylbenzene (1.34 g; 10 mmol) in 1,2-dichloroethane (50 mL) was added phosphorus pentachloride (2.5 g; 12 mmol) followed by chlorosulfonic acid (1.3 mL; 20 mmol) slowly. The mixture was heated at 80° C. overnight, then cooled to room temperature and mixed with ice water (150 mL). The organic phase was separated, and the aqueous phase was extracted with dichloromethane (2×10 mL). The organic phases were combined and dried over magnesium sulfate and concentrated under reduced pressure to give an orange oil which was used without further purification (2.3 g).

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