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aromatic biphenyle

Submitted by Anonymous on 10 July 2005 - 5:29pm.

Is biphenyle an exception of the Hueckel theory? It is aromatic even though it has 12 (4n + 0) conjugated pi-electrons.

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Submitted by Anonymous on 11 July 2005 - 6:22am.

Huckel's theory only applies to monocyclic rings. Biphenyl is polycyclic.

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Submitted by Anonymous on 11 July 2005 - 8:00am.

Yer, each ring is aromatic on its own, and you can draw a couple of canonical forms to show they can interact with each other, but only do Hückel counting on each individual ring.

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Submitted by Anonymous on 11 July 2005 - 9:21am.

ok, thanks

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Submitted by Anonymous on 19 July 2005 - 8:48pm.

well, what does Hückel's theory say about condensed aromatic systems then? nothing?

I mean it works with all of them but they are not monocyclic.

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