Just to put everyone on the same page the issue is when to mark a bond between two aromatic atoms as aromatic? Consider the following where the fused bond is always single and not in an aromatic ring (only the outer ring is 4n+2). [image: Inline images 1][image: Inline images 2] [image: Inline images 3]
Regards, John W May john.wilkinson...@gmail.com On 7 August 2015 at 10:01, John M <john.wilkinson...@gmail.com> wrote: > I'm still unsure on this but I believe it is correct. Consider biphenyl - > a bond between aromatic atoms is not always aromatic. We could perhaps say > then a bond between aromatic atoms that is in a ring is aromatic but then > consider biphenylene? > > In your example it is the outer envelope ring that is aromatic and that > fused bond is always single. Another example is azulene. I'm send also to > the mailing list as this probably needs some discussion. > > John > >
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