ClC1C=CC=C(C(OO)=[O:9])C=1.C(Cl)(Cl)Cl.[CH3:16][S:17][CH:18]([C:26]1[CH:31]=[CH:30][C:29]([Cl:32])=[CH:28][CH:27]=1)[C:19]1[CH:24]=[CH:23][C:22]([Cl:25])=[CH:21][CH:20]=1.C(=O)([O-])[O-].[K+].[K+]>O>[CH3:16][S:17]([CH:18]([C:19]1[CH:20]=[CH:21][C:22]([Cl:25])=[CH:23][CH:24]=1)[C:26]1[CH:31]=[CH:30][C:29]([Cl:32])=[CH:28][CH:27]=1)=[O:9]A solution of 10.7 grams (0.0525 mole) of m-chloroperbenzoic acid in 150 ml. of chloroform was slowly added to a cool solution (5°-7° C.) of 14.1 grams (0.050 mole) of bis(p-chlorophenyl)methyl methyl sulfide (prepared above) in 500 ml. of chloroform, and the resulting solution stirred for two hours at a temperature of 5° C., while a white precipitate formed. The mixture after warming to ambient temperature and holding at this temperature for a two hour period was then mixed with a solution having 20 grams of potassium carbonate in 200 ml. of water. The chloroform phase was then removed and washed with 100 ml. of water, and the chloroform distilled off by vacuum distillation leaving 14.7 grams of a crude product which was recrystallized twice from 2,2,4-trimethylpentane-benzene (2:1) mixture to yield 11.7 grams (78 percent) of the white colored solid of bis(p-chlorophenyl)methyl methyl sulfoxide with a melting point of 109.5°-110.5° C.
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