
doi: 10.1007/bf00673438
Hollow hexagons form a subclass of primitive coronoid systems. The macrocyclic aromatic hydrocarbon kekulene corresponds to a hollow hexagon. The hollow hexagons for given numbers of hexagonal units (h) were enumerated by computer aid, but also an analytical solution for the numbers of hollow hexagons was achieved. For the Kekule structure counts (k) of a hollow hexagon a general formula is reported. Also the maximum and minimumK numbers are considered.
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