Abstract
Cationic palladium(II) complexes of the type [ PdMe ( NCMe ) ( N – N ′ ) ] [ BAr 4 ′ ] 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 ( M w/ M n) of the obtained polyketones resulted among the best reported for C s -bisnitrogen planar ligands.
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