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Updated: Oct 3, 2026
10:51
The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
Published on: April 10, 2015
Ruthenatetraboranes: Molecular Structure of [Ru(B(3)H(8))(PPh(3)){kappa(3)-HB(pz)(3)}] (pz = Pyrazol-1-yl)
Ian D. Burns1, Anthony F. Hill, David J. Williams
1Department of Chemistry, Imperial College of Science, Technology and Medicine, South Kensington, London SW7 2AY.
Inorganic Chemistry
|April 24, 1996
Abstract
No abstract available in PubMed .
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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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Like benzene, cyclobutadiene and cyclooctatetraene are cyclic compounds with alternate single and double bonds. However, their chemical behavior differs from benzene, as they are unstable and not aromatic. So, what are the structural characteristics of unsaturated compounds categorized as aromatic?
For the first time, Eric Hückel, a German chemical physicist, derived a set of structural features for a compound to be classified as aromatic. This is now known as Hückel’s rule or the 4n + 2 rule.
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