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Resonance forms of pyracyclene

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Enthalpy:

--- Quote from: Orcio_87 on November 09, 2022, 04:03:39 PM ---It looks like it fullfils the Huckel's rule, so all four structures should be equal.
--- End quote ---
I don't grab this logic. Does Hückel's rule tell anything more than "aromatic"? In 1,2-dichlorobenzene, I don't expect both forms to be equally probable.

njoyeux:

--- Quote from: Enthalpy on November 10, 2022, 06:09:41 AM ---
--- Quote from: Orcio_87 on November 09, 2022, 04:03:39 PM ---It looks like it fullfils the Huckel's rule, so all four structures should be equal.
--- End quote ---
I don't grab this logic. Does Hückel's rule tell anything more than "aromatic"? In 1,2-dichlorobenzene, I don't expect both forms to be equally probable.

--- End quote ---

I don't grab the logic either.

Plus, on the following research paper pyracylene is described as a bordeline case of aromaticity.
https://pubs.acs.org/doi/pdf/10.1021/ja012541%2B


What does that tell us?

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