1,2-Dimethylbenzimidazole → 1,1'-{disulfanediylbis[ethane-2,1-diylimino(2-oxoethane-2,1-diyl)]}bis(2,3-dimethyl-1H-benzimidazol-3-ium) chloride

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A mixture of compound 1,2-dimethyl-1H-benzimidazole (2.93 g, 20 mmol) and N,N′-(disulfanediyldiethane-2,1-diyl)bis(2-chloroacetamide) (1.53 g, 5 mmol) in 20 ml of acetonitrile was heated to reflux for 24 h. After cooling, the resulting white solids were collected by filtration and washed with ethyl acetate and dichloromethane to afford 1.94 g of a white powder. Analyses were in accordance with the expected structure.

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