Triethylamine → N-(2-Chloro-4-methylphenyl)methanesulfonamide

A solution of 2-chloro-4-methylaniline (5.00 g) and triethylamine (3.57 g) in dichloromethane (100 ml) was cooled to 0° C. Methanesulphonyl chloride (4.04 g) was added dropwise and the mixture stirred at ambient temperature overnight. The mixture was then washed with 2N aqueous hydrochloric acid solution (50 ml) and the solvent removed by evaporation. The residue was dissolved in ethyl acetate (75 ml) extracted with 2N aqueous sodium hydroxide solution (2×50 ml). The aqueous phase was acidified with 2N aqueous hydrochloric acid solution and extracted with ethyl acetate (2×75 ml). This was subsequently dried (MgSO4) and the solvent evaporated. Thus was obtained N-(2-chloro-4-methylphenyl)methanesulphonamide (2.5 g, 32%). NMR Spectrum 2.33 (3H, s), 2.97 (3H, s), 6.6 (1H, s), 7.10 (1H, d), 7.25 (1H, s), 7.52 (1H, d).