Benzenesulfonyl chloride → Benzenesulfonamide, N-(4-nitrophenyl)-

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Reaction Steps

A solution of 4-nitroaniline (4-7) (13.8 g, 100 mmol) and phenylsulfonyl chloride (14 mL, 100 mmol) in pyridine (50 mL) was heated at 100° C. for 2 h. The resultant solution was concentrated, and the residue dissolved in ethyl acetate. The organic extract was washed successively with 2M hydrochloric acid, sat. aq. sodium bicarbonate brine, dried over magnesium sulfate, filtered and concentrated under vacuum. The residue was dissolved in a minimum amount of ethyl acetate with warning, and hexane added until the solution turned cloudy. The mixture was allowed to cool slowly to RT and then chilled at 0° C. The yellow solid precipitated was obtained by filtration. Further drying under vacuum overnight provide N-phenylsulfonyl-4-nitroaniline.

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