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Useful Concepts | ![]() |
Aromaticity is a property associated with the extra stability of certain types of π systems due to the nature of the molecular orbitals. It is not restricted to substituted benzenes, 6-membered rings or just hydrocarbons.
Based on the properties of compounds, there are FOUR criteria about the π system that need to be met in order for the "special" aromatic stabilisation to be observed:
In order for a compound to be aromatic, all FOUR of these criteria must be met.
The most important and well known aromatic system is benzene:
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To aid in counting the electrons the following factors may help:
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© Dr. Ian Hunt, Department of Chemistry, University of Calgary | ![]() |
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