Abstract
Abstract1,1″‐(1,3‐Propanediyl)bis‐4,4′‐bipyridinium dibromide is converted to 1,1″‐(1,3‐propanediyl)bis[1′‐(3‐hydroxypropyl)‐4,4′‐bipyridinium] tetrabromide by reaction with 1,3‐dibromopropane in hot aqueous dimethylformamide. The tetraquaternary salt participates in a dequaternization and coupling reaction on treatment with hot aqueous hydrobromic acid to afford an octaquaternary salt, which is readily converted to decaquaternary and dodecaquaternary derivatives. The 1,4‐butanediyl analogue participates in a similar sequence of reactions.
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