Clar's rule of polycyclic aromatic hydrocarbons

Asked Jul 28 '20 at 13:42

Active Jul 29 '20 at 02:03

Viewed 362 times

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?

edited Jul 28 '20 at 20:34

Mithoron

4,546
14
40
61

asked Jul 28 '20 at 13:42

mohamed

1

And what reason other then "it works" would you like? These are just some rules of thumb not a Relativity Theory. – Mithoron Jul 28 '20 at 14:44
1

what is clar's rule? Please add more detail into your question. – Aniruddha Deb Jul 28 '20 at 14:56
2

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3982536/ – Nilay Ghosh Jul 28 '20 at 15:20
@Mithoron i just wanted to know why it works, the mechanism behind it, and not to prove its validity – mohamed Jul 28 '20 at 19:19
@NilayGhosh i saw this article but it doesn't address the mechanism behind the rule. – mohamed Jul 28 '20 at 19:47
@AniruddhaDeb i edited the question – mohamed Jul 28 '20 at 19:47
OK, we''ll see if it's reopened. I guess MOT can give some more insight then simple rule about this. – Mithoron Jul 28 '20 at 20:36
related https://chemistry.stackexchange.com/questions/16562/is-pyrene-aromatic-despite-failing-h%c3%bcckels-rule – Mithoron Jul 28 '20 at 21:19
You might agree that it is a good and reasonable starting point. – Alchimista Jul 29 '20 at 09:27

Clar's rule of polycyclic aromatic hydrocarbons

0 Answers0