An efficient visible light induced rhodium(I)catalyzedr egioselective borylation of aromatic C À Hb onds is reported. The photocatalytic system is based on asingle NHC À Rh I complex capable of both harvesting visible light and enabling the bond breaking/forming at room temperature.The chelating nature of the NHC-carboxylate ligand was critical to ensure the stability of the Rh I complex and to provide excellent photocatalytic activities.E xperimental mechanistic studies evidenced ap hotooxidative ortho C À Hb ond addition upon irradiation with blue LEDs,leading to acyclometalated Rh IIIhydride intermediate.
The asymmetric functionalization of C−H bond is a particularly valuable approach for the production of enantioenriched chiral organic compounds. Chiral N‐heterocyclic carbene (NHC) ligands have become ubiquitous in enantioselective transition‐metal catalysis. Conversely, the use of chiral NHC ligands in metal‐catalyzed asymmetric C−H bond functionalization is still at an early stage. This minireview highlights all the developments and the new advances in this rapidly evolving research area.
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