Angewandte Chemie International Edition · 2018 · 162 citations · 80 references
Natural SciencesChemical EngineeringChemistryCatalysisInorganic ChemistryOrganic ChemistryCatalytic MechanismsCoordination ChemistryMetal CatalysisPhotocatalysisPhotochemistryRedox CatalysisChemoselective CatalysisChemoselective SynthesisCopper CatalysisLigand ExchangeLigand Exchange ReactionsPhotoactive Metal ComplexesPhotocatalytic OxidationVisible-light Photocatalysis
Abstract The visible‐light‐accelerated oxo‐azidation of vinyl arenes with trimethylsilylazide and molecular oxygen as stoichiometric oxidant was achieved. In contrast to photocatalysts based on iridium, ruthenium, or organic dyes, [Cu(dap) 2 ]Cl or [Cu(dap)Cl 2 ] were found to be unique for this transformation, which is attributed to their ability to interact with the substrates through ligand exchange and rebound mechanisms. Cu II is proposed as the catalytically active species, which upon coordinating azide will undergo light‐accelerated homolysis to form Cu I and azide radicals. This activation principle (Cu II ‐X→Cu I +X . ) opens up new avenues for copper‐based photocatalysis.
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Photoredox Catalysis with Visible Light
Kirsten Zeitler · Angewandte Chemie International Edition · 2009 · 982 citations