The general procedure for the synthesis of the target compound (CAS: 454-65-9) from 3-bromobenzenesulfonyl chloride was as follows: to a stirred solution of 3-bromobenzenesulfonyl chloride (5 g, 0.0196 mol) in acetonitrile (20 ml) was added potassium fluoride (2.27 g, 0.0391 mol) and 18-crown-6 ether (0.08 g) sequentially and the reaction mixture was stirred at room temperature for for 18 hours. After completion of the reaction, the reaction mixture was washed with water (60 ml) and subsequently extracted with ethyl acetate (3 x 80 ml). The organic extracts were combined and dried with anhydrous sodium sulfate (Na2SO4). Finally, the solvent was evaporated under reduced pressure to give a yellow oily product (3.79 g, 81% yield). The 1H NMR (CDCl3) data of the product were as follows: δ 7.55 (1H, t), 7.92 (1H, d), 7.95 (1H, d), 8.14 (1H, s).
