Acetonitrile → 1,1'-(Disulphanediyldiethane-2,1-diyl)bis(2-methylpyridinium)dibromide

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A mixture of 56 g of 1-bromo-2-[(2-bromoethyl)disulfanyl]ethane and 15 ml of N-methylpyrrolidone (NMP) was poured dropwise over 35 g of 2-picoline with stirring at 80° C. The mixture (white suspension) continued to be stirred for 30 min at 80° C., then 100 ml of acetonitrile were added and the stirring was continued at 80° C. for 90 min. After cooling, the solid obtained was filtered, washed with 100 ml of acetonitrile, then dried. 56.2 g of brown powder were recovered. 45 g of this powder were suspended in 300 ml of isopropanol, under reflux. Once the temperature dropped to 40° C., the solid was filtered, washed with three times 100 ml of isopropanol and dried under vacuum. Thus, 40.56 g of a light beige product was obtained. Analyses were in accordance with the expected structure.

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