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Algebraic Kekulé Formulas for Benzenoid Hydrocarbons
Journal of Chemical Information and Computer Sciences, 2004By assigning two pi-electrons of CC double bonds in a Kekulé valence structure to a benzene ring if not shared by adjacent rings and one pi-electron if CC double bond is shared by two rings we arrived at numerical valence formulas for benzenoid hydrocarbons.
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Benzenoids with Repeated Units
1988Benzenoids with repeated (identical) units have been encountered in several places of the preceding chapters. Already the single linear and zigzag chains (see, e.g. Fig. 4.9 or CHART 6-II) may be considered as (trivial) benzenoids with repeated units.
S. J. Cyvin, I. Gutman
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Benzenoid Systems: Basic Concepts
1988The main topic of the present book is the enumeration of Kekule structures in benzenoid hydrocarbons. Since enumeration is essentially a mathematical procedure, it is beneficial to seek for an appropriate mathematical representation of benzenoid hydrocarbons as well as of Kekule structures.
S. J. Cyvin, I. Gutman
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Clar Covers of Overlapping Benzenoids: Case of Two Identically-Oriented Parallelograms
Symmetry, 2020Henryk A Witek, Johanna Langner
exaly