[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[NH:9][C:10]([S:15][C:16]([F:19])([F:18])[F:17])=[CH:11][C:12]=2[C:13]#[N:14])=[CH:4][CH:3]=1.OO.C(OCC)(=[O:24])C.[OH2:28]>C(O)(=O)C>[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[NH:9][C:10]([S:15]([C:16]([F:17])([F:19])[F:18])(=[O:24])=[O:28])=[CH:11][C:12]=2[C:13]#[N:14])=[CH:4][CH:3]=1A solution of 2-(p-chlorophenyl)-5-[(trifluoromethyl)thio]pyrrole-3-carbonitrile (0.6 g, 0.002 mol) in acetic acid is treated portionwise with 30% hydrogen peroxide solution (0.6 mL, 0.006 mol), stirred for 11/2 hours at 90° C., treated with additional hydrogen peroxide (0.3 mL, 0.003 mol), stirred for two hours at 90° C. stirred for 16 hours at room temperature and diluted with an ethyl acetate/water mixture. The organic phase is separated, washed with water and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a solid. The solid is recrystallized from ethylene dichloride to give the title product as a beige solid (mp 228°-230° C.) which is identified by 1HNMR and 13CNMR spectral analyses.
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