Aromaticity

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Aromaticity

Aromaticity (/əˌrɒməˈtɪsɪti/) is a chemical property in which a conjugated ring of unsaturated bonds, lone pairs, or empty orbitals exhibit a stabilization stronger than would be expected by the stabilization of conjugation alone. It is also known as Hückel's rule.

Etymology

The term "aromaticity" was coined from the Greek word "aroma" which means fragrance. This is because many of the earliest-known examples of aromatic compounds, like benzene, have distinct, pleasant smells.

Related Terms

  • Conjugation: The overlap of one p-orbital with another across an intervening σ bond.
  • Benzene: A colorless and flammable liquid with a sweet smell and a relatively high melting point. It is an important industrial solvent and precursor in the production of drugs, plastics, synthetic rubber, and dyes.
  • Hückel's rule: A rule used to determine if a planar ring molecule will have aromatic properties.
  • Annulene: A system of conjugated monocyclic hydrocarbons. They are named as [n]annulene, where n is the number of carbon atoms in the ring, for example, [10]annulene.
  • Antiaromaticity: A characteristic of a cyclic molecule with a π electron system that has higher energy due to the presence of 4n electrons in it.

See Also

External links

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