[Br:1][C:2]1[CH:9]=[CH:8][C:5]([CH2:6][SH:7])=[CH:4][CH:3]=1.[Br:10][C:11]1[CH:18]=[CH:17][C:14]([CH2:15]Br)=[CH:13][CH:12]=1.C(N(CC)CC)C.O>ClCCl>[Br:1][C:2]1[CH:9]=[CH:8][C:5]([CH2:6][S:7][CH2:15][C:14]2[CH:17]=[CH:18][C:11]([Br:10])=[CH:12][CH:13]=2)=[CH:4][CH:3]=1To a solution of 1.85 g (9.11 mmol) of 4-bromobenzylmercaptan in dry dichloromethane (30 ml) were added 2.72 g (10.9 mmol) of 4-bromobenzyl bromide and 2.31 g (22.8 mmol) of triethylamine in an atmosphere of argon, and the mixture was allowed to react at room temperature for 16 hours. To the solution was added water followed by extraction with ethyl acetate. The organic layer was washed with water and then concentrated under reduced pressure. The residue thus obtained was subjected to silica gel column chromatography for separation and purification. Elution with ethyl acetate-hexane (1:4) yielded 3.08 g (8.29 mmol) of bis(4-bromobenzyl)sulfide.
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