π-Conjugated poly(quinone)s. Preparation by using Ni(0) complex and properties of the new type π-conjugated polymers

Dehalogenation polycondensation of dichloroquinones with a zerovalent nickel complex gives polyquinones having π-conjugation systems. poly(2-methylanthraquinone-1, 4-diyl) and poly(anthraquinone-1, 5-diyl) are reduced chemically with Na2S2O4 as well as electrochemically to give semiconducting materials.