What do the structures of all aromatic compounds have in common?
The answer is NOT a benzene ring. all aromatic compounds have 1) delocalized pi electrons (usually in conjugated double bonds) 2) 4n+2 pi electrons to be shared on adjacent atoms… this is “Huckles” rule 3) a planar structure 4) rings.. aromatic compounds are cyclic examples of an aromatic compounds that do not contain benzene rings are furan, thiophene, pyridine http://en.wikipedia.org/wiki/Furan http://en.wikipedia.org/wiki/Thiophene http://en.wikipedia.org/wiki/Pyridine other examples of aromatic compounds that do not have a benzene ring… 14-annulene 18-annulene you can read about annulenes here… http://en.wikipedia.org/wiki/Annulene and the molecule doesn’t have to be neutral either. Cyclopropenium cation is a stabl
