" Adapted irom Mackay et al. (1992) and Mackay and Callcott (1998). Structures and numbering Loening et al. (1990). 6 From Bjorseth (1983).

are based on

IUPAC recommendations; see

hydrocarbon is that in which the maximum number of rings have the benzenoid arrangement of three double bonds" (Fieser and Fieser, 1956). This statement is consistent with a subsequent proposal by Clar (1972) that for such polyarenes one should maximize the number of "aromatic sextets."

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