[CH3:1][C:2]1[CH:7]=[CH:6][C:5]([CH3:8])=[CH:4][C:3]=1[CH2:9][S:10][C:11]1[CH:16]=[C:15]([CH3:17])[CH:14]=[CH:13][N+:12]=1[O-:18].OO.[OH2:21].C(O)(=[O:24])C>[O-][W]([O-])(=O)=O.[Na+].[Na+]>[CH3:1][C:2]1[CH:7]=[CH:6][C:5]([CH3:8])=[CH:4][C:3]=1[CH2:9][S:10]([C:11]1[CH:16]=[C:15]([CH3:17])[CH:14]=[CH:13][N+:12]=1[O-:18])(=[O:24])=[O:21]The sulfide isolated in step (a) above was dissolved in 20 ml of glacial acetic acid and 1.5 ml of 30% hydrogen peroxide was added along with 100 mg of sodium tungstate. The reaction mixture was heated at 40° C. for one hour, cooled, and poured into water to percipitate the product. Yield, 1.46 or 89%. NMR supported the proposed structure.
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