Novel benzenoid hydrocarbons such as 1 can be obtained from a naphthalene derivative in several cobalt-catalyzed steps. Although 1 contains a [4n + 2]π-system, its electronic structure must by described in terms of cyclobutadiene units. Compounds such as 1 are of interest for the synthesis of “organic metals”.
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Helson et al. (1985) studied this question.
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