title: Palladium(0) deposited on PAMAM dendrimers as a catalyst for C-C cross coupling reactions.
abstract: PAMAM dendrimers of generations G2-G3 as well as a partially substituted derivative of generation G4 and a low-molecular-weight tricyclic ligand 4 were used to bind Pd(0) nanoparticles. The obtained adducts were tested as catalysts for C-C cross-coupling reactions, such as the Suzuki-Miyaura, Hiyama, Heck and Sonogashira reaction. The highest yields of the coupling product, diphenylacetylene, were obtained with all the catalysts studied in the Sonogashira coupling performed in ethanol with K₂CO₃ as base. Very good results, 85-100%, were also found in the Suzuki-Miyaura cross-coupling, while the efficiency of the Hiyama coupling appeared lower, with 38-52% of 2-methylbiphenyl formed. In all reactions, the G2-Pd(0) catalyst, containing an unmodified dendrimer, afforded the highest yields of the cross-coupling products.
authors.affiliation: Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie Str., 50-383 Wrocław, Poland.
authors.forename: Tomasz
authors.initials: T
authors.lastname: Borkowski
authors.forename: Paweł
authors.initials: P
authors.lastname: Subik
authors.forename: Anna M
authors.initials: AM
authors.lastname: Trzeciak
authors.forename: Stanisław
authors.initials: S
authors.lastname: Wołowiec
mesh_terms: D000114:Acetylene / Q000031:analogs & derivatives / Q000737:chemistry; D002384:Catalysis; D050091:Dendrimers / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D010165:Palladium / Q000737:chemistry*
chemical_list: D050091:Dendrimers; C104700:PAMAM Starburst; C044735:biphenylacetylene; D010165:Palladium; D000114:Acetylene