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The structure of poly(phthalidylidenearylene)s, synthesized by electrophilic substitution reactions, was studied using 1H and 13C NMR spectroscopy. Homopolycondensation of 3‐aryl‐3‐chlorophthalides 1a – d in nitrobenzene leads to para‐substituted linear polymers 2a – d, whereas polycondensation of phthaloyl dichloride and bis[4‐(3‐chloro‐3‐phthalidyl)phenyl] ether (6) with diphenyl ether results in polymers 5 containing irregular units.
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Zolotukhin et al. (1985) studied this question.
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