The largest submit of the carbon allotrope “graphyne”, title compound 1, is also a potential precursor to circular [6]phenylene, antikekulene. Single and double CpCo-catalyzed cycloisomerization provided the respective angular [3]- and [5]phenylenes. Their spectroscopic data indicate that they harbor superdelocalization.
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Eickmeier et al. (1997) studied this question.
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