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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
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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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Azolium-Porphyrin Electrosynthesis.

Fatima Akhssas1, Rongning Lin1, Michal Trojan1,2

  • 1Institut de Chimie Moléculaire de l'Université de Bourgogne UMR6302, CNRS, Univ. Bourgogne, 9 avenue Alain Savary, 21000, Dijon, France.

Chemsuschem
|August 22, 2024
PubMed
Summary

Researchers synthesized novel azolium-porphyrins through electrochemical oxidation of zinc(II) porphyrins with azole derivatives. These compounds exhibit strong ligation, and their electronic properties were analyzed, revealing electron-withdrawing effects from azolium substituents.

Keywords:
Anodic nucleophilic substitutionAzole nucleophilesAzoliumElectrochemistryElectrosynthesisPorphyrinoids

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Area of Science:

  • Coordination Chemistry
  • Electrochemistry
  • Organic Synthesis

Background:

  • Zinc(II) porphyrins are versatile macrocyclic complexes with applications in catalysis and materials science.
  • Azole derivatives are nitrogen-containing heterocycles with diverse chemical properties.
  • Electrochemical methods offer mild and efficient synthetic routes for complex molecule preparation.

Purpose of the Study:

  • To synthesize novel meso-substituted azolium-porphyrins using electrochemical oxidation.
  • To investigate the coordination behavior of azole derivatives with zinc(II) porphyrin complexes.
  • To characterize the synthesized compounds and analyze their electronic properties.

Main Methods:

  • Electrochemical oxidation of zinc(II) 2,7,12,17-tetra-tert-butylporphyrin in the presence of various azole derivatives.
  • Demetalation/remetalation procedures to recover zinc(II) complexes.
  • X-ray crystallography for structural elucidation.
  • Cyclic voltammetry for electronic property analysis.

Main Results:

  • Successful synthesis of meso-substituted azolium-porphyrins under mild conditions with good yields.
  • Strong ligation of azole nucleophiles to zinc(II) azolium-porphyrin complexes was observed.
  • X-ray crystal structures of three azolium-porphyrins were determined.
  • Cyclic voltammetry indicated significant electron-withdrawing effects of the azolium substituents.

Conclusions:

  • Electrochemical oxidation provides an effective route to azolium-porphyrins.
  • The azolium moiety strongly influences the electronic properties of zinc(II) porphyrin complexes.
  • The developed methodology allows for the synthesis and characterization of novel porphyrin derivatives.