Quasi-coronoid

A helicenic system which is a simply connected polyhex (without holes) may be called a helicenic quasi-benzenoid. For the sake of brevity it is sometimes called just simply a helicene. In this section we have also seen examples of helicenic quasi-coronoids. They are referred to as helicirculenes. 

The classification of polyhexes treated above is surveyed schematically in Fig. 2. In the following we shall avoid the terms quasi-benzenoid and quasi-coronoid. 

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