A cyclo[n]carbon is a chemical compound consisting solely of an n number of carbon atoms linked in a ring by double covalent bonds (a cyclic cumulene). Since the compound is composed only of carbon atoms, it is considered an exotic carbon allotrope. If n is even there is an alternative structure where the bonds alternate between single and triple bonds (a cyclic polyyne). The (hypothetical) six-carbon member of this family (C6) is also called benzotriyne.
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