Define Aromaticity in chemistry
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In organic chemistry, the term aromaticity is used to describe a cyclic (ring-shaped), planar (flat) molecule with a ring of resonance bonds that exhibits more stability than other geometric or connective arrangements with the same set of atoms. Aromatic molecules are very stable, and do not break apart easily to react with other substances. Organic compounds that are not aromatic are classified as aliphatic compounds—they might be cyclic, but only aromatic rings have special stability (low reactivity).
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What is aromaticity?
Aromaticity is a property which a molecule has if all the following 4 conditions are met:
Aromaticity is such a stabilizing property (worth 20-36 kcal/mol) that generally a molecule that is
cyclic
conjugated
has (2n + 1) pairs of pi electrons
will also be flat.
(Give a molecule a large enough potential energy well, and it will fall into it eventually.)
The only thing that would prevent a molecule fulfilling the first three conditions from being flat is if the flat conformation is incredibly strained.
One example in this category is the molecule known as [10]-annulene, an isomer of which is drawn below. In the trans, cis, trans, cis, cis isomer, the molecule is cyclic, conjugated, and has 10 pi electrons, but the two marked hydrogens bump into one another when the molecule tries to adopt a flat conformation
Aromaticity is a property which a molecule has if all the following 4 conditions are met:
Aromaticity is such a stabilizing property (worth 20-36 kcal/mol) that generally a molecule that is
cyclic
conjugated
has (2n + 1) pairs of pi electrons
will also be flat.
(Give a molecule a large enough potential energy well, and it will fall into it eventually.)
The only thing that would prevent a molecule fulfilling the first three conditions from being flat is if the flat conformation is incredibly strained.
One example in this category is the molecule known as [10]-annulene, an isomer of which is drawn below. In the trans, cis, trans, cis, cis isomer, the molecule is cyclic, conjugated, and has 10 pi electrons, but the two marked hydrogens bump into one another when the molecule tries to adopt a flat conformation
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