Surface catalysed Suzuki-Miyaura cross-coupling by Pd nanoparticles: an operando XAS study.
Size-controlled, catalytically active PVP-stabilised Pd nanoparticles have been studied by operando liquid phase XAS during the Suzuki cross-coupling of iodonanisole and phenylboronic acid in MeOH-toluene using KOMe base. XAS reveals nanoparticles are stable to metal leaching throughout the reaction, with surface density Pd defect sites directly implicated in the catalytic cycle. The efficacy of popular selective chemical and structural poisons for distinguishing heterogeneous and homogeneous contributions in Pd catalysed cross-couplings is also explored.
Lee
Adam F
AF
Cardiff Catalysis Institute, School of Chemistry, Cardiff University, UK. leeaf@cardiff.ac.uk
Ellis
Peter J
PJ
Fairlamb
Ian J S
IJ
Wilson
Karen
K
D000840:Anisoles / Q000737:chemistry; D001897:Boronic Acids / Q000737:chemistry; D002384:Catalysis; D007700:Kinetics; D053768:Metal Nanoparticles / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D010165:Palladium / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D013499:Surface Properties; D056928:X-Ray Absorption Spectroscopy; D014961:X-Ray Diffraction
D000840:Anisoles; D001897:Boronic Acids; D010165:Palladium; D012822:Silicon Dioxide; C060998:anisole; C010686:benzeneboronic acid