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Stability of Substituted Cyclohexanes02:30

Stability of Substituted Cyclohexanes

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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...
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Stability of Conjugated Dienes01:28

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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

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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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Facile Preparation of 4-Substituted Quinazoline Derivatives
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Thermodynamically Stable o-Quinodimethane: Synthesis, Structure, and Reactivity.

Kazuhiko Adachi1, Shunsuke Hirose1, Yasuyuki Ueda1

  • 1Department of Applied Chemistry for Environment, Kwansei Gakuin University, 2-1 Gakuen, Sanda, 669-1337, Japan.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|November 7, 2020
PubMed
Summary

Thermal isomerization of cyclobutaphenanthrene yields stable o-quinodimethane. This intermediate undergoes dual cycloaddition, forming complex polycyclic aromatic hydrocarbons like tetrabenzopentacene.

Keywords:
arynecycloadditioncyclobutaarenespolycyclic aromatic hydrocarbonquinodimethanes

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry
  • Polycyclic Aromatic Hydrocarbons

Background:

  • Cyclobutaphenanthrenes are strained polycyclic aromatic hydrocarbons.
  • Thermal ring-opening reactions are crucial for generating reactive intermediates.
  • o-Quinodimethanes are versatile building blocks in organic synthesis.

Purpose of the Study:

  • To investigate the thermal isomerization of substituted cyclobutaphenanthrenes.
  • To isolate and characterize the resulting o-quinodimethane intermediates.
  • To explore the synthetic utility of the isolated o-quinodimethanes.

Main Methods:

  • Thermal isomerization of cyclobutaphenanthrene derivatives.
  • Spectroscopic methods for structural elucidation (e.g., NMR, Mass Spectrometry).
  • Diels-Alder reactions for cycloaddition studies.

Main Results:

  • Substituents on the cyclobutaphenanthrene core influence the ease of ring-opening.
  • Stable o-quinodimethanes were successfully isolated and characterized.
  • A dual [4+2] cycloaddition reaction with an aryne yielded tetrabenzopentacene.

Conclusions:

  • The thermal isomerization provides a viable route to stable o-quinodimethanes.
  • Isolated o-quinodimethanes are valuable synthons for constructing complex polycyclic systems.
  • This methodology enables the synthesis of novel polycyclic aromatic hydrocarbons.