Two Reversible σ‑Bond Metathesis Pathways for Boron–Palladium Bond Formation: Selective Synthesis of Isomeric Five-Coordinate Borylpalladium Complexes

Two reversible σ-bond metathesis pathways for B–B bond activation to give borylpalladium complexes are demonstrated in the reaction of η2-(Si–H)­Pd­(0) complexes with B2pin2. These two pathways are connected by fluxional behavior of the Si–H bond and can be efficiently controlled by the appropriate choice of phosphine ligand, enabling the selective synthesis of two types of five-coordinate borylpalladium complexes.