1: 4-bromo-2-chlorobenzene-1-sulfonyl chloride With sodium hydrogencarbonate; sodium sulfite in water T=75°C; 2 h; 2: methyl iodide in water T=20 - 100°C; 0.0333333 h;

3-chloro-benzenecarboperoxoic acid in dichloromethane 2 h;

sodium acetate in ethanol 18 h; Heating / reflux;