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A Simple Invariant of the Kekule Structures

If a benzenoid system is drawn so that some of its edges are vertical, then the double bonds in such a system (in a Kekule structure) can have one of the following three orientations  [Pg.16]

The following property of the Kekule structures seems to have been overlooked for many decades. It was put forward as late as in 1986  [Pg.17]

Theorem 7 [87]. All Kekule structures of a benzenoid molecule have the same triplet (x, y, z). [Pg.17]

In Fig. 2 are depicted the seven Kekule structures of benzoanthracene. The reader can easily verify that each of them has x = 2, y = 3, z = 4. [Pg.17]

Not all triplets of positive integers correspond to benzenoid systems. The difficult problem of the characterization of such triplets was solved by Zhang and Guo [88, 137], [Pg.17]


See other pages where A Simple Invariant of the Kekule Structures is mentioned: [Pg.16]   


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