31P NMR Study of Active Species for Ethylene Dimerization in ?-Aryl Nickel Complex-AgClO4

Article abstract of DOI:10.1246/bcsj.56.818

and are active for ethylene dimerization in the presence of AgClO4.The activity increases with increase in the amount of AgClO4 and reaches maximum at AgClO4/Ni-complex = 2.Addition of excess AgClO4 leads to marked decrease in activity with but a little decrease with . 31P NMR spectra of the active solution showed new resonance peaks due to and (X' = F, Cl), accompanying formation of AgX (X = Br, Cl) and .Thus the role of AgClO4 is to abstract halide anion and/or triphenylphosphine.The amount of is in good correlation with the rate of dimerization, which suggests this species to be catalytically active.