[CH3:1][N:2]1[C:6](=[O:7])[C:5]([Cl:9])([Cl:8])[C:4]([Cl:11])([Cl:10])[S:3]1.C(Cl)(Cl)Cl.ClC1C=CC=C(C(OO)=[O:24])C=1.ClC1C=C(C=CC=1)C(O)=O>C(=O)=O>[CH3:1][N:2]1[C:6](=[O:7])[C:5]([Cl:8])([Cl:9])[C:4]([Cl:10])([Cl:11])[S:3]1=[O:24]To a solution of 2.55g. (0.01 mole) of 2-methyl-4,4,5,5-tetrachloro-3-isothiazolidinone in 10 ml. of chloroform at 0° is added a solution of 2.03g. (0.01 mole) of m-chloroperbenzoic acid (85% Technical) in 60 ml. of chloroform. The mixture is allowed to warm to room temperature and stand over a weekend. The solution is cooled in dry ice. White solid (m-chlorobenzoic acid) separates (0.91g.) and is removed by filtration. The filtrate is washed in a separatory funnel with 50 ml. of water containing 0.4g. of sodium bicarbonate. The chloroform solution is separated and dried over magnesium sulfate. Evaporation gives 2.54g. of crude product as a white solid.
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