Hyperbranched Poly[bis(alkylene)pyridinium]s

Abstract

Abstract 3,5‐Bis(bromomethyl)pyridine hydrobromide and 3,5‐bis(bromobutyl)pyridine hydrobromide were synthesized from commercially available 3,5‐lutidine. The poly( N‐ alkylation) of these monomers readily yielded new hyperbranched polyelectrolytes. The progress of reaction was followed by 1 H NMR. A second‐order kinetic scheme fits the experimental data. Rate constants and activation parameters were determined, showing the higher reactivity of 3,5‐bis(bromomethyl)pyridine hydrobromide. This was explained by the electron‐attractive effect of pyridinium groups on the CH 2 Br end groups. The structures of the hyperbranched poly[3,5‐bis(alkylene)pyridinium]s were investigated by 1 H and 13 C NMR spectroscopy and a preliminary study of their properties is reported. magnified image