Suzuki-Miyaura coupling reactions using novel metal oxide supported ionic palladium catalysts

Abstract Palladium substituted CeO 2 , SnO 2 and their mixed oxides have been synthesized in quantitative yields out of non-toxic and inexpensive precursors using a simple and rapid single step solution combustion method. The resulting oxides, especially the mixed oxides Ce 0.79 Sn 0.20 Pd 0.01 O 2-δ , Sn 0.79 Ce 0.20 Pd 0.01 O 2-δ and Sn 0.99 Pd 0.01 O 2-δ proved to be highly active (TOF > 12,000 h −1 ) for Suzuki-Miyaura cross-couplings of phenylboronic acid with various bromoarenes. The reactions were carried out in ambient air at moderate temperatures using environmentally friendly aqueous ethanol solutions as reaction solvents. Minimal amounts of palladium in the product solution (  C coupling catalysts.