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Related Concept Videos

Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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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.
Removing one hydrogen from the intervening CH2 group...
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Criteria for Aromaticity and the Hückel 4n + 2 Rule01:20

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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 +...
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Aromatic Hydrocarbon Anions: Structural Overview01:18

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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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Frost Circles for Different Conjugated Systems01:18

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The inscribed polygon method is consistent with Hückel’s 4n + 2 rule and helps to learn whether the given cyclic compound is aromatic or not. The compound is stable and aromatic if every bonding molecular orbital (MO) is completely filled with a pair of electrons. However, if the non-bonding or antibonding orbitals are filled with electrons, the compound is unstable and not aromatic. Consider the Frost circle diagrams for cycloalkenes containing 4 to 8 carbons.
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Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
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Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

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Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
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Tunable aromaticity in bicalicenes.

Marcos Mandado1, Nicolás Ramos-Berdullas

  • 1Department of Physical Chemistry, University of Vigo, Lagoas-Marcosende s/n, 36310, Vigo, Spain. mandado@uvigo.es.

Physical Chemistry Chemical Physics : PCCP
|June 11, 2015
PubMed
Summary
This summary is machine-generated.

Cyclic bicalicene

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Area of Science:

  • Organic Chemistry
  • Theoretical Chemistry
  • Computational Chemistry

Background:

  • Cyclic bicalicene exhibits unique aromatic stability.
  • This stability is hypothesized to stem from a tetraionic structure.

Purpose of the Study:

  • To investigate the tetraionic structure's role in bicalicene's aromatic stability.
  • To explore methods for tuning aromatic stabilization through chemical and electrical means.

Main Methods:

  • Computational analysis including energetic, magnetic, geometric, and electron delocalization studies.
  • Examination of bicalicene derivatives with varying electron-donating/withdrawing groups.
  • Application of electrical perturbations to bicalicene structures.

Main Results:

  • Computational analyses corroborated the significance of the tetraionic structure.
  • Chemical and electrical tuning successfully modulated electron delocalization and aromaticity.
  • Observed electron delocalization mirrored that of cyclopropene cation and cyclopentadiene anion under perfect polarization.

Conclusions:

  • The tetraionic structure is crucial for the aromatic stability of cyclic bicalicene.
  • Aromatic stabilization can be effectively tuned by manipulating charge distribution.
  • Understanding charge polarization provides insights into aromaticity in related systems.