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Redox Reactions01:24

Redox Reactions

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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Oxidation of Phenols to Quinones01:17

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In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

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Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
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Redox Equilibria: Overview01:23

Redox Equilibria: Overview

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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Wilhelm Rudolph Fittig discovered the pinacol coupling reaction in 1859. It is a radical dimerization reaction and involves the reductive coupling of aldehydes or ketones in the presence of hydrocarbon solvent to yield vicinal diols.
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Thieno[3,2-b]thiophene Incorporated Redox Active 22π and 34π Core-Modified Expanded Isophlorinoids.

Hosahalli S Udaya1, Venkataramanarao G Anand1

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Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 15, 2024
PubMed
Summary

New thieno[3,2-b]thiophene-based hexaphyrins exhibit planar, aromatic structures unlike furan analogs. Spectro-electrochemical analysis confirms reversible two-electron oxidation, yielding 4nπ dicationic species.

Keywords:
AnnulenesAromaticityMacrocyclesPorphyrinoidsSpectroelectrochemistry

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Porphyrinoids are macrocyclic compounds with diverse optoelectronic properties.
  • Hexaphyrins, a class of porphyrinoids, can adopt various conformations and aromaticities.
  • Modifying the core structure of hexaphyrins can tune their electronic and structural characteristics.

Purpose of the Study:

  • To investigate the impact of incorporating thieno[3,2-b]thiophene units into a hexaphyrin framework.
  • To compare the aromaticity and optoelectronic properties of novel hexaphyrins with existing porphyrinoids.
  • To explore the conformational changes induced by replacing furan with thiophene or selenophene moieties.

Main Methods:

  • Synthesis of novel hexaphyrin derivatives containing thieno[3,2-b]thiophene.
  • Conformational analysis using spectroscopic techniques.
  • Spectro-electrochemical studies to probe redox behavior and electronic transitions.

Main Results:

  • Thieno[3,2-b]thiophene incorporation extends the π-circuit, altering optoelectronic properties compared to 22π and 34π porphyrinoids.
  • Furan-based hexaphyrin adopts a non-aromatic 'figure-of-eight' conformation.
  • Replacement of furan with thiophene or selenophene leads to planar, aromatic hexaphyrin structures.
  • Reversible two-electron ring oxidation was observed, forming 4nπ dicationic species.

Conclusions:

  • The strategic incorporation of thieno[3,2-b]thiophene units significantly influences the aromaticity and conformation of hexaphyrins.
  • Thiophene and selenophene analogs exhibit enhanced aromatic character and planarity.
  • These novel hexaphyrins demonstrate potential for applications in optoelectronics due to their tunable properties and redox behavior.