[C:1]1([S:7]([CH2:10][S:11]([C:14]2[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=2)(=[O:13])=[O:12])(=[O:9])=[O:8])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.Br[CH2:21][CH2:22][CH2:23]Br.[OH-].[Na+].[Cl-].[NH4+]>[Br-].C([N+](CCCC)(CCCC)CCCC)CCC.ClCCl>[C:1]1([S:7]([C:10]2([S:11]([C:14]3[CH:15]=[CH:16][CH:17]=[CH:18][CH:19]=3)(=[O:13])=[O:12])[CH2:23][CH2:22][CH2:21]2)(=[O:8])=[O:9])[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=1
A mixture of bis(phenylsulfonyl)methane (30 g, 100 mmol), tetra-n-butylammonium bromide (3 g, 9.3 mmol), 1,3-dibromopropane (30 ml), dichloromethane (600 ml) and 50% aqueous sodium hydroxide (150 ml) was stirred at room temperature for 3 days. The mixture was poured onto saturated aqueous ammonium chloride solution and extracted into dichloromethane. The combined organic extracts were dried (Na2SO4) and concentrated. The residue was crystallised from i-hexane:diethyl ether to give the title product as a white solid. Yield−24 g (71%).
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