[CH3:1][N:2]1[C:6]([N+:7]([O-:9])=[O:8])=[CH:5][N:4]=[C:3]1[CH2:10][O:11][C:12]1[CH:17]=[CH:16][C:15]([S:18][CH3:19])=[CH:14][CH:13]=1.ClC1C=CC=C(C(OO)=[O:28])C=1.C(=O)([O-])[O-].[Na+].[Na+]>C(Cl)(Cl)Cl>[CH3:1][N:2]1[C:6]([N+:7]([O-:9])=[O:8])=[CH:5][N:4]=[C:3]1[CH2:10][O:11][C:12]1[CH:17]=[CH:16][C:15]([S:18]([CH3:19])=[O:28])=[CH:14][CH:13]=127.9 Grams (0.1 mol) of 1-methyl-2-(4-methylthiophenyloxymethyl)-5-nitro-imidazole are dissolved in 200 ml of chloroform, and the solution is added dropwise while stirring at 25° C. to a solution of 17.25 g (0.1 mol) of m-chloroperbenzoic acid in 70 ml of chloroform. The reaction mixture is stirred for 1 hour at 25° C., the solution is shaken with dilute sodium carbonate solution, the chloroform phase is separated, dried over sodium sulfate and evaporated. The residue is recrystallized from ethanol with the addition of charcoal.
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