Mobius—Polyhexes

Already Balaban and Harary (1968) pointed out (in a footnote) the hypothetic possibilities to form Mobius counterparts of polyhex hydrocarbons. The Mobius versions of cydacenes and their zigzag-chain analogues are mentioned specifically elsewhere (Balaban 1980 1988), and the Kekule structure counts for these systems have been determined (Cyvin 1990). 

Notice that the two perimeters of kekulene have merged into one. In consequence, Mobius—kekulene has only two annulenoid Kekule structures versus the number four in kekulene (cf. Par. 2.5.2). The total number of Kekule structures in Mobius—kekulene is K = 198 (Cyvin 1990). 

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