Abstract
Neutral (π-allyl)palladium(II) halide complexes, which are air and moisture tolerant, containing dialkylbiaryl (alkyl=cyclohexyl or t-butyl) phosphine ligands, have been synthesized and characterized by 1H, 31P, 13C NMR spectroscopy, X-ray crystallography, and elemental analysis. Exposure of the halide complexes to sodium tetrakis(3,5-bis(trifluoromethyl)tetraphenylborate) (NaB(ArF)4) yields (π-allyl)palladium(II) cations, in which coordination of the pendent lower ring of the biphenyl moiety of the dialkylbiaryl phosphine ligand occurs. These cations have been characterized by 1H, 31P, 13C NMR spectroscopy, X-ray crystallography, and elemental analysis. The cationic complexes are not fluxional on the NMR timescale and a significant interaction exists between palladium and the arene group.
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