Syntheses and spectroscopic characteristics of dialkylpalladium(II) complexes; PdR2(cod) as precursors for derivatives with N- or P-donor ligands

Cycloocta-1,5-diene dialkylpalladium(II) derivatives, PdR2(cod), (R=CH2SiMe3, CH2SiMe2Ph) have been isolated and used conveniently as precursors in the preparation of dialkylpalladium complexes, PdR2L2, with N- or P-donor ancillary ligands (R=CH2SiMe3; L2=bipy, phen, dppp, dpkt or tmen; L=PMe3; R=CH2SiMe2Ph; L2=bipy; dpkt). The complexes Pd(CH2CMe2Ph)2(dppe) and PdMe2(bipy) were also prepared from their cyclooctadiene analogues. All have been characterized by 1H-, 13C- and 31P-NMR and IR spectroscopy.