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In a 400 ml flask, 200 ml of o-dichlorobenzene, 1 ml of pyridine and 2.0 g (0.01 mole) of 2-chloro-4-trifluoromethylaniline were charged. While stirring the contents, 2.8 g (0.01 mole) of 2-chloro-5-trifluoromethylbenzenesulfonylchloride was added dropwise at room temperature over 5 minutes. Thereafter, the reaction mixture was heated and stirred for 8 hours under reflux (175°-180° C.). After cooling the reaction mixture to room temperature, it was thoroughly washed first with dilute hydrochloric acid and then with water. Subsequent to its dehydration with anhydrous sodium sulfate, o-dichlorobenzene was distilled off under reduced pressure. The residue was subjected to silica gel chromatography (eluent: benzene) to isolate the intended Compound 2. m.p. 122°-123° C., yield 2.2 g (50%).

1. additionwas added dropwise at room temperature over 5 minutes
2. temperatureThereafter, the reaction mixture was heated
3. temperatureunder reflux (175°-180° C.)
4. washit was thoroughly washed first with dilute hydrochloric acid
5. distillationSubsequent to its dehydration with anhydrous sodium sulfate, o-dichlorobenzene was distilled off under reduced pressure