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Updated: Sep 17, 2026
![Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F60786.jpg&w=3840&q=50)
Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
Published on: July 17, 2020
Redox-active photocatalytic N^C cyclometalated gold(III) catecholate complexes
Miguel A Gonzálvez1, Sergio Diaz-Alonso1, Juan José Gamboa-Carballo2
1Laboratoire Hétérochimie Fondamentale et Appliquée (LHFA, UMR 5069), CNRS/Université de Toulouse, 118 Route de Narbonne, 31062, Toulouse cedex 9, France.
Abstract:
The redox properties and photocatalytic activity of four N^C cyclometalated Au(III) catecholate complexes were investigated. They proved competent for the photocatalytic C-H arylation of furan with aryldiazonium salts under green LED irradiation. UV-vis studies supported the formation of electron donor-acceptor adducts between the Au(III) catecholate complexes and diazonium salts, enabling photoinduced electron transfer and aryl radical generation. Electrochemical, EPR, and DFT studies evidenced ligand-centered redox activity and the formation of Au(III) semiquinone species.
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