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Tricarbonyl rhenium(i) tetrazolato and N-heterocyclic carbene complexes: versatile visible-light-mediated photoredox catalysts. 2019

Thomas P Nicholls, and Liam K Burt, and Peter V Simpson, and Massimiliano Massi, and Alex C Bissember
School of Natural Sciences - Chemistry, University of Tasmania, Hobart, Tasmania 7001, Australia. alex.bissember@utas.edu.au.

We have investigated the capacity of a range of structurally-diverse, photoactive rhenium(i) tricarbonyl complexes featuring either tetrazolato or N-heterocyclic carbene (NHC) ligands to facilitate fundamental classes of visible-light-mediated photoredox-catalysed reactions. In this study, we demonstrate that these systems mediate representative atom-transfer radical addition, hydrodehalogenation, and α-amino C-H functionalisation reactions. These rhenium(i) complexes provide greater or at least comparable reactivity to the prototypical photoredox catalyst [Ru(bpy)3]2+ in many cases.

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