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Chemical and electrochemical dehalogenation polycondensations of 2,6-dichloroquinoline, 2,6-dibromoquinoxaline, and 2,6-dichloro-1,5-naphthyridine using nickel complexes afford poly(quinoline-2,6-diyl), poly(quinoxaline-2,6-diyl) and poly(1,5-naphthyridine-2,6-diyl), respectively. These polymers take linear structures, and have more extensively delocalized π-conjugation system as well as higher electron-accepting properties than their isomeric poly(quinoline-5,8-diyl) and poly(quinoxaline-5,8-diyl) as revealed by their λmax positions and reducing potentials.
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Saito et al. (1993) studied this question.
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