Unstoichiometric Suzuki- Miyaura cyclic polymerization of extensively conjugated monomers

Suzuki-Miyaura polycondensation of an excess of linearly extended, conjugated dibromo monomer with meta-phenylenediboronate and of an excess of the extensively conjugated, kinked dibromo monomer with para-phenylenediboronate in the presence of (Bu3PPd)-Bu-t(0) precatalyst, which has a strong propensity for intramolecular -face transfer, afforded cyclic polymers with M-n 12400-6400, although unstoichiometric polycondensation generally affords linear polymers.