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Related Concept Videos

Stability of Substituted Cyclohexanes02:30

Stability of Substituted Cyclohexanes

14.7K
This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
14.7K
Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

4.2K
Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Valence Bond Theory02:42

Valence Bond Theory

11.1K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Molecular Orbital Theory II03:51

Molecular Orbital Theory II

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Molecular Orbital Energy Diagrams
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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...
3.6K
π Molecular Orbitals of 1,3-Butadiene01:24

π Molecular Orbitals of 1,3-Butadiene

11.2K
Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the number...
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Updated: Jan 11, 2026

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

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Cyclopentadienyl-Lithium Complexes: A Computational Exploration of Bonding Interactions and Structural Stability.

M Esther Sánchez-Castro1, Mario Sánchez2

  • 1Sustentabilidad de los Recursos Naturales y Energía, Cinvestav, Unidad Saltillo, Parque Industrial Saltillo-Ramos Arizpe, Av. Industria Metalúrgica 1062, Ramos Arizpe, Coahuila, C.P. 25900, Mexico.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|November 9, 2025
PubMed
Summary

Neutral cyclopentadienyl-lithium complexes exhibit stronger lithium-Cp bonds than anionic ones. Bonding is driven by electrostatics and charge transfer, guiding future materials design.

Keywords:
cyclopentadienyl–lithium complexesdensity functional theorynatural bond orbitalnatural energy decomposition analysisorganometallic chemistry

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A Protocol for Safe Lithiation Reactions Using Organolithium Reagents
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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
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1,3,5-Triphenylbenzene and Corannulene as Electron Receptors for Lithium Solvated Electron Solutions
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Area of Science:

  • Organometallic Chemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Cyclopentadienyl-lithium (CpLi) complexes are crucial in catalysis and materials science.
  • Understanding Cp-Li bonding is key to designing advanced materials.

Purpose of the Study:

  • Investigate bonding interactions in CpnLin (n=1-6) complexes.
  • Characterize structural and electronic properties of these complexes.

Main Methods:

  • Density Functional Theory (DFT).
  • Natural Bond Orbital (NBO) analysis.
  • Natural Energy Decomposition Analysis (NEDA).

Main Results:

  • Neutral CpLi complexes show significantly stronger Cp-Li bonds ( -175.22 to -184.52 kcal mol-1) than anionic ones.
  • NEDA reveals electrostatic and charge transfer as primary stabilizing forces.
  • Subtle stabilization in neutral complexes arises from second-order donor-acceptor interactions involving σ(C-H) bonds.

Conclusions:

  • Insights into CpLi bonding and stability provide a basis for designing materials with specific properties.
  • Further research on larger clusters and functionalized ligands is recommended.