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Enumeration of branched catacondensed benzenoid hydrocarbons and their numbers of kekulé structures

✍ Scribed by A.T. Balaban; J. Brunvoll; B.N. Cyvin; S.J. Cyvin

Publisher
Elsevier Science
Year
1988
Tongue
French
Weight
556 KB
Volume
44
Category
Article
ISSN
0040-4020

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✦ Synopsis

The computerized enumerations of unbranched catafusenes (ca condensed benzenoids) are summarized . The systems are classified accord to symmetry . The numbers of helicenic systems are given explicitly . The results of enumerations .for branched catafusenes are also reported, and the systems without helicenes for 4 < h 1 12 are classified according to symmetry . Here h denotes the number of hexagons . For the branched catafusenes without helicenes all Kekul1 structure counts (K) /rare computed . Some characteristic values of K (K min , ' Kabund , Kmax) are discussed . The subscripts refer to the minimum, most abundant and maximum value . is the average . As one of the original results it was found Kmax -504 for h .42 . This K number is realized in two isoarithmic branched catafusenes . Quantities of the type (lnK)!h display especially interesting behaviour .

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