876371-33-4Relevant academic research and scientific papers
Pyrazolyl-pyrimidine based ligands in palladium catalyzed copolymerization and terpolymerization of CO/olefins
Bella, Antonio F.,Ruiz, Aurora,Claver, Carmen,Sepúlveda, Francisco,Jalón, Felix A.,Manzano, Blanca R.
, p. 1269 - 1275 (2008)
Cationic palladium(II) complexes of the type [PdMe (NCMe) (N - N′)] [BAr4′] containing bisnitrogen ligands with a pyrazole moiety were synthesized from the corresponding neutral derivatives [PdClMe(N-N′)]. Their characterization by 1H and 13C NMR spectroscopy in solution evidences the presence of the Pd-Me group cis to the pyrazole ring. The catalytic behaviour of the cationic complexes in CO/4-tert-butylstyrene copolymerization and CO/ethylene/4-tert-butylstyrene terpolymerization was investigated. Productivity was greatly enhanced when the reaction was carried out in 2,2,2-trifluoroethanol (TFE). Molecular weights and polydispersity (Mw/Mn) of the obtained polyketones resulted among the best reported for Cs-bisnitrogen planar ligands.
