Approach to Bridged Planar Polythiophene Derivatives for Maximization of Extended π-Conjugation

摘要

We have been directing synthetic efforts toward the construction of conjugated macromolecules that are fixed in a planar conformation. The planar conformations should maximize the extended Tt-conjugation. Additionally, the bridging units, if sp2-hybridized, should further increase the extended Jt-conjugation of the macromolecular systems.1-2 We previously described a synthetic route to planar poly(p-phenylene) derivatives by the retrosynthetic approach outlined in eq 1 (M = metal).3 The actual synthetic components are shown in eq 2.