[CH3:1][N:2]1[CH:6]=[N:5][N:4]=[C:3]1SC.C([O-])(O)=O.[Na+].C1C=C(Cl)C=C(C(OO)=O)C=1.[O-:25][S:26]([O-:29])(=S)=O.[Na+].[Na+].[C:32]([O-])([O-])=O.[Na+].[Na+]>C(Cl)Cl>[CH3:1][N:2]1[CH:6]=[N:5][N:4]=[C:3]1[S:26]([CH3:32])(=[O:29])=[O:25]To a solution of 4-methyl-3-(methylsulfanyl)-4H-1,2,4-triazole (31 g, 239.96 mmol, 1 eq.) in 1000 ml of DCM cooled to 0° C. was added NaHCO3 (42.33 g, 503.92 mmol, 2.1 eq.) followed by m-CPBA (70%, 118.31 g, 479.92 mmol, 2.0 eq.) portion wise. The reaction was warmed to r.t. and stirred. A sat. aqueous 1/1 Na2S2O3/Na2CO3 solution was added slowly and the mixture stirred 15 min. The layers were separated and the organics were washed with H2O, dried over MgSO4 and concentrated. The crude was triturated in IPE and filtered to give 4-methyl-3-(methylsulfonyI)-4H-1,2,4-triazole (9.35 g, 59% yield) as yellow solid.
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