Phenalene Phenanthrenes

In Figure 29 we have illustrated the simplest shapes on a hexagonal map, those given by the periphery of benzene, naphthalene, anthracene, phenanthrene, phenalene, and pyrene. A simple way to represent the periphery of such objects parallels the description of a route on a dodecahedron outlined in the book by Rouse Ball and... 

This is the first attempt to review all fused heterocyclic systems (6 6 6) containing at least one ring junction heteroatom. There are three classes of these systems, namely heterocyclic analogues of anthracene, phenanthrene, and phenalene, which are surveyed in Tables 1-3 respectively. Please... 

Altogether we have generated all the nonisomorphic C42H20 single coronoid isomers 82 (5971+26+2102) in consistency with the entries in Table 2. Also the distribution of corona holes is consistent with Table 4 72 naphthalene (h = 2, np = 0) holes, 9 phenalene (h<> = 3, ti-o = 1) holes, and 1 phenanthrene hP = 3, = 0) hole. 

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