High molecular mass, uniform structure, and complete solubility characterize the novel ladder polymers 1. The formation of dication 2 from a model analogue of 1 by oxidation with 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) and subsequent dehydration with trifluoromethanesulfonic acid reveals that 1 is a potent precursor for the preparation of heteroanalogous, ionic poly[n]acenes. R1 = p-C6H4-n-C10H21, R2 = p-C6H4rBu; counterion CF3SO.
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Freund et al. (1995) studied this question.
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