Preparation of hyperbranched copolymers containing triphenylamine and divinylbenzene units

In the presence of palladium(II) acetate, the coupling reaction of tris(4-bromophenyl)amine 1 and p-divinylbenzene 2 gave a hyperbranched conjugated copolymer 4 in a one step process and in a high yield. Polymer 4 was soluble in organic solvents such as THF and chloroform. GPC indicated that it had an average molecular weight of 5.1 × 103. A cast film had an anodic peak at 1.05 V vs Ag wire. It was blue above the oxidation potential and light-yellow in the neutral state.