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First use of a divalent lanthanide for visible-light-promoted photoredox catalysis

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Abstract

We report the first catalytic use of a divalent lanthanide in visible-light-promoted bond-forming reactions. Our new precatalyst uses europium in the +2 oxidation state and is active in the presence of blue light from light-emitting diodes. The use of low-energy visible light reduces the occurrence of potential side reactions that might be induced by higher-energy UV light. The system described here uses zinc metal as a sacrificial reductant and is tolerant to wet, protic solvents. The catalyst can be made in situ from relatively inexpensive and air-stable EuCl3·6H2O, and the ligand can be synthesized in large quantities in two steps. With 0.5% loading of precatalyst, an average of 120 turnovers was observed in six hours for reductive coupling of benzyl chloride. We expect that the results will initiate the study of visible-light-promoted photoredox catalysis using divalent europium in a variety of reactions.

Graphical abstract: First use of a divalent lanthanide for visible-light-promoted photoredox catalysis

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Publication details

The article was received on 02 Jun 2017, accepted on 13 Dec 2017 and first published on 21 Dec 2017


Article type: Edge Article
DOI: 10.1039/C7SC02479G
Citation: Chem. Sci., 2018, Advance Article
  • Open access: Creative Commons BY license
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    First use of a divalent lanthanide for visible-light-promoted photoredox catalysis

    T. C. Jenks, M. D. Bailey, Jessica L. Hovey, S. Fernando, G. Basnayake, M. E. Cross, W. Li and M. J. Allen, Chem. Sci., 2018, Advance Article , DOI: 10.1039/C7SC02479G

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