The two methods approach the question differently. The general method tries to incorporate mesomeric and tautomeric rearrangement, as in 2-pyridone, while the basic method does not. In the basic method the external double bond breaks the formation of an aromatic ring.
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Molecule in aliphatic form |
Basic aromatization |
General aromatization |
Converting structure from Kekulé form to aromatic form |
Converting structure from aromatic form to Kekule form |