For all Kekuléan perifusenes with 4, 5, and 6 benzenoid rings the partitions of π-electrons in each ring have been calculated. Trends in the partitions are discussed in connection with Clar's structures. Partition values are useful for discerning similarity/dissimilarity among benzenoids independently of visual overlapping of formulas and for comparing local features of benzenoids such as bay or cove regions.
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Balaban et al. (2004) studied this question.
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