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Related Concept Videos

Structure of Benzene: Molecular Orbital Model01:18

Structure of Benzene: Molecular Orbital Model

9.0K
According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
9.0K
Constitutional Isomers of Alkanes02:18

Constitutional Isomers of Alkanes

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Organic compounds of the same molecular formula can have different structural formulas called constitutional isomers, and the phenomenon is known as constitutional isomerism. Alkanes with four or more carbons showing multiple structures with the same molecular formula thereby exhibit constitutional isomerism.
The linear isomer of an alkane is prefixed by the term “n”; hence a linear isomer of pentane is known as n-pentane. Based on the type of branching, some of the...
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Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
46.8K
Structural Isomerism02:34

Structural Isomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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Exceptions to the Octet Rule02:55

Exceptions to the Octet Rule

28.1K
Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
28.1K
NMR Spectroscopy of Benzene Derivatives01:34

NMR Spectroscopy of Benzene Derivatives

8.0K
Simple unsubstituted benzene has six aromatic protons, all chemically equivalent. Therefore, benzene exhibits only a singlet peak at δ 7.3 ppm in the 1H NMR spectrum. The observed shift is far downfield because the aromatic ring current strongly deshields the protons. Any substitution on the benzene ring makes the aromatic protons nonequivalent, and the protons split each other. The peak is, therefore, no longer a singlet and the splitting pattern and their associated coupling...
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Related Experiment Video

Updated: Jun 19, 2025

Synthesis of 1,2-Azaborines and the Preparation of Their Protein Complexes with T4 Lysozyme Mutants
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Boron-Nitrogen-Containing Benzene Valence Isomers.

Tomoya Ozaki1, Shih-Yuan Liu1

  • 1Department of Chemistry, Boston College, Chestnut Hill, Massachusetts, 02467-3860, USA.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|July 26, 2024
PubMed
Summary
This summary is machine-generated.

Researchers explored boron-nitrogen (BN) benzene valence isomers, which are strained heterocyclic compounds. Their synthesis and potential applications were investigated through photoisomerization of 1,2-azaborines.

Keywords:
AzaborinesBN-heterocycleBenzvaleneDewar benzenePhotoisomerization

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Area of Science:

  • Organic Chemistry
  • Heterocyclic Chemistry
  • Photochemistry

Background:

  • Benzene is a fundamental structure in chemistry.
  • Valence isomers of benzene exhibit unique bonding and reactivity.
  • Boron-nitrogen (BN) heterocycles are of significant interest.

Purpose of the Study:

  • To investigate boron-nitrogen-containing benzene valence isomers.
  • To explore their synthesis and characterization.
  • To understand their formation mechanism and potential applications.

Main Methods:

  • Photoisomerization of 1,2-azaborines.
  • Synthesis of BN-heterocyclic compounds.
  • Characterization techniques.

Main Results:

  • Successful synthesis of highly strained BN-benzene valence isomers.
  • Elucidation of their structural and bonding properties.
  • Proposed mechanism for their formation via photoisomerization.

Conclusions:

  • BN-benzene valence isomers represent a novel class of strained heterocycles.
  • Photoisomerization of 1,2-azaborines is an effective synthetic route.
  • These compounds hold potential for future applications in chemistry.