Dinuelear Palladium Complexes—Precursors or Catalysts ?

摘要

The basis of palladium coupling chemistry lies in a bond-forming step between electrophile and nucleophile, facilitated by complexation of one or both components to the transition metal. In classic "textbook" mechanisms, a single palladium atom acts as pivot for sequential addition, coupling, and elimination steps. The rich organometallic chemistry of palladium is not based entirely on monopalladium complexes; di- and oligonuclear species are common and frequently feature Pd-Pd bonds. In their classic review of this field, Murahashi and Kurosawa identify diverse families of dinuclear complexes, most with Pd-Pd bonds.