[CH2:1]([O:4][C:5]1[CH:19]=[CH:18][C:8]([CH2:9][S:10][CH2:11][CH2:12][N:13]2[CH:17]=[CH:16][N:15]=[N:14]2)=[CH:7][CH:6]=1)[CH:2]=[CH2:3].ClC1C=C(C(OO)=[O:28])C=CC=1>ClCCl.C(OCC)(=O)C>[CH2:1]([O:4][C:5]1[CH:19]=[CH:18][C:8]([CH2:9][S:10]([CH2:11][CH2:12][N:13]2[CH:17]=[CH:16][N:15]=[N:14]2)=[O:28])=[CH:7][CH:6]=1)[CH:2]=[CH2:3]To a solution of 1.90 g (6.9 mmol) 1-[2-(4-all yloxy-benzylsulfanyl)-ethyl]-1H-[1,2,3]triazole in 150 ml dichloromethane was added dropwise at −30° C. a solution of 1.86 g (8.3 mmol) 3-chloro-benzenecarboperoxoic acid in 40 ml ethyl acetate and stirring continued for 1 hour. The mixture was allowed to warm up over night, washed with sodium bicarbonate and sodium carbonate solution, then with water, dried and evaporated. Elution form silica with ethyl acetate/methanol 5:1 furnished 1.25 g (62%) 1-[2-(4-allyloxy-phenylmethanesulfinyl)-ethyl]-1H-[1,2,3]triazole as white solid.
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