Differences between the Basic and General aromatization methods

The two method approach the question differently. The general method tries to incorporate mesomeric, tautomeric rearrangement, as in 2-pyridone, while the basic method does not. In the basic method the external double bond breaks the formation of aromatic ring.

The 2-pirydone is aromatic due to its mesomeric rearrangement:

The following molecules will give different results depending upon the method applied.

Molecule in aliphatic form	Basic aromatization	General aromatization
**IUPAC name: ** pyridin-2(1H)-one
**IUPAC name: ** 2-thioxo-2,3-dihydropyrimidin-4(1H)-one
**IUPAC name: ** 2,4-dihydro-3H-1,2,4-triazol-3-thione
**IUPAC name: ** 9H-xanthen-9-one
**IUPAC name: ** 5-thioxo-1,2,4-triazolidin-3-one
**IUPAC name: ** imidazo[1,5-a]pyridine-3(2H)-thione