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Related Concept Videos

Criteria for Aromaticity and the Hückel 4n + 2 Rule01:20

Criteria for Aromaticity and the Hückel 4n + 2 Rule

14.3K
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 +...
14.3K
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

4.1K
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.
Due to the absence of continuous...
4.1K
Frost Circles for Different Conjugated Systems01:18

Frost Circles for Different Conjugated Systems

4.0K
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.
4.0K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

4.1K
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...
4.1K
Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

5.9K
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,...
5.9K
Electrophilic Aromatic Substitution: Overview01:16

Electrophilic Aromatic Substitution: Overview

15.0K
In an electrophilic aromatic substitution reaction, an electrophile substitutes for a hydrogen of an aromatic compound.
15.0K

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Related Experiment Video

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Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
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On exo-cyclic aromaticity.

Tamal Goswami1, Manoswita Homray, Satadal Paul

  • 1Department of Chemistry, University of North Bengal, Darjeeling 734013, India. anirbanmisra@yahoo.com.

Physical Chemistry Chemical Physics : PCCP
|April 28, 2017
PubMed
Summary
This summary is machine-generated.

Aromaticity in C2B2F4 is demonstrated, extending beyond conventional limits. This molecule achieves six π-electrons via unusual exo-cyclic contributions, confirmed by computational methods.

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Solid-phase Synthesis of [4.4] Spirocyclic Oximes
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Solid-phase Synthesis of [4.4] Spirocyclic Oximes
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Area of Science:

  • Quantum Chemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Aromaticity is a fundamental concept in chemistry, observed in hydrocarbons, heterocycles, and all-metal systems.
  • Understanding aromaticity in novel molecular structures is crucial for advancing chemical theory and materials design.

Purpose of the Study:

  • To investigate and demonstrate aromaticity in the C2B2F4 molecule.
  • To explore the electronic mechanisms contributing to aromaticity in this non-conventional system.
  • To confirm the stability and properties of C2B2F4 using advanced computational techniques.

Main Methods:

  • In silico demonstration of aromaticity.
  • Density Functional Theory (DFT) calculations.
  • Ab initio calculations.
  • Molecular Dynamics (MD) simulations.

Main Results:

  • Aromaticity was successfully demonstrated in the C2B2F4 molecule.
  • The molecule achieves the 'magic number' of six π-electrons.
  • An unusual electronic contribution from exo-cyclic atoms was identified as key to its aromaticity.
  • Stability was confirmed through rigorous theoretical calculations and simulations.

Conclusions:

  • C2B2F4 exhibits aromaticity, expanding the known scope of aromatic systems.
  • Exo-cyclic electronic contributions are vital for achieving aromaticity in certain novel molecules.
  • The computational methods employed provide robust evidence for the aromatic nature and stability of C2B2F4.