In Situ Trapped and Immobilized Palladium Nanoparticles as Active and Clean Catalysts for Suzuki-Miyaura Reaction

Active palladium nanoparticles were trapped and immobilized in situ by Pd-catalyzed Suzuki-Miyaura reaction to form heterogeneous Pd catalysts. This Pd@PhPad₂ catalyst was found to be highly active, recyclable and clean for the Suzuki-Miyaura reaction. Both the anchored diadamantylphosphine ligand and the formation of polyphenylene polymer improved the activity and stability of the Pd@PhPad₂ catalyst for Suzuki-Miyaura reaction. The Pd@PhPad₂ catalyst was reusable, and no contamination (P ligand or Pd) was detected from the catalyst system for the coupling reaction.