Kekulene, a kind of “super-benzene”, is a compound suitable for distinguishing between annulenoid (1a) and benzenoid aromaticity (1b). It has now proved possible to synthesize kekulene and to record the 1H-NMR spectrum of this highly insoluble compound. The spectrum is interpreted as supporting the benzenoid form (1b).
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Diederich et al. (1978) studied this question.
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