The Jarvo Lab, in collaboration with the Yang and Hirschi labs, reported a mechanistic study that sheds light on why certain some nickel catalysts have a tendency to promote open-shell (radical) while others promote closed-shell (polar) transformations.

You can their article in the Nature Communications journal: Ligand hardness as a key feature differentiating base- versus noble-metal mechanisms of nickel-catalyzed Suzuki-Miyaura cross-couplings