Scheme 3. Proposed Multimetallic Mechanism for Two-Catalyst Cross-Electrophile Coupling XEC.^a.

^a Based upon CV data, we depict oxidative addition at (L1)Ni^IX and at (L2)Ni⁰. It is important to note that oxidative addition could occur from either oxidation state, but results in the same arylnickel(II) intermediate. Similarly, this proposal does not attempt to account for potential ligand exchange processes.