Clar's rule states that the Kekulé resonance structure with the largest number of disjoint aromatic π-sextets, i.e., benzene-like moieties, is the most important for characterization of properties of polycyclic aromatic hydrocarbons (PAHs). What is the reason for the validity of Clar's rule?

I mean why does polybenzoid structures follow Clar's rule (what is the mechanism lying behind it) and what is the reason for the stability of these structures?

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    $\begingroup$ And what reason other then "it works" would you like? These are just some rules of thumb not a Relativity Theory. $\endgroup$
    – Mithoron
    Jul 28, 2020 at 14:44
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    $\begingroup$ what is clar's rule? Please add more detail into your question. $\endgroup$ Jul 28, 2020 at 14:56
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    $\begingroup$ ncbi.nlm.nih.gov/pmc/articles/PMC3982536 $\endgroup$ Jul 28, 2020 at 15:20
  • $\begingroup$ @Mithoron i just wanted to know why it works, the mechanism behind it, and not to prove its validity $\endgroup$
    – mohamed
    Jul 28, 2020 at 19:19
  • $\begingroup$ @NilayGhosh i saw this article but it doesn't address the mechanism behind the rule. $\endgroup$
    – mohamed
    Jul 28, 2020 at 19:47


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