Titlebook: Advances in the Theory of Benzenoid Hydrocarbons; Ivan Gutman,Sven J. Cyvin Conference proceedings 1990 Springer-Verlag Berlin Heidelberg

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,Methods of enumerating Kekulé structures, exemplified by applications to rectangle-shaped benzenoid by several methods. The oblate rectangles, R.(., .), with fixed values of . are treated most extensively and used to exemplify different procedures based on the method of fragmentation (chopping, summation), a fully computerized method (fitting of polynominal coefficients), application of the John-

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https://doi.org/10.1057/9780230358911: either a (perturbative) restriction to a smaller model space or orthogonalization of a suitable natural basis for the model space. The known properties of the models are indicated, and possible methods of solution are mentioned. A great diversity of work is outlined, related, systematized and extended. New research is suggested.

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Andrea Morán Ferrés,Miguel Fernández Labayen in the last few years. In this chapter we review the main results and give a rigorous proof for some necessary and sufficient conditions for the existence of Kekulé structures in a benzenoid system. In addition, by using the above results, a construction method of some concealed non-Kekuléan benzenoid systems is given.

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,The existence of Kekulé structures in a benzenoid system, in the last few years. In this chapter we review the main results and give a rigorous proof for some necessary and sufficient conditions for the existence of Kekulé structures in a benzenoid system. In addition, by using the above results, a construction method of some concealed non-Kekuléan benzenoid systems is given.

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