In 1931, Erich Hückel postulated that monocyclic (single ring) planar
compounds that contained carbon atoms with unhybridized atomic p
orbitals would possess a closed bond shell of delocalized π electrons if
the number of π electrons in the molecule fit a value of 4
n + 2 where
n equaled any whole number. Because a closed bond shell of π
electrons defines an aromatic system, you can use Hückel's Rule to
predict the aromaticity of a compound. For example, the benzene
molecule, which has 3 π bonds or 6 π electrons, is aromatic.
Tuesday 30 April 2013
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