Synthesis and reactivity of organometallic nickel(II) complexes obtained by oxidation of nickel(0) complexes with halogenated organic compounds
作者:Benedetto Corain、Giancarlo Favero
DOI:10.1039/dt9750000283
日期:——
Reaction of the complexes [Ni(dpb)2][dpb = 1,4-bis(diphenylphosphino)butane] and [Ni(dpp)2][dpp = 1,3-bis(diphenylphosphino)propane] with RCOX (R = Ph or Et; X = Cl or Br) in benzene, in molar ratio 1 : 1, at room temperature, produces nickel(II)-acyl complexes. The spontaneous decomposition of these species produces nickel(II) dihalogenodiphosphino-complexes, nickel(0) monocarbonyldiphosphino-complexes
Ligand exchange reaction between NiMe2L2 (L = bpy, PEt3) and ditertiary phosphines Ph2P(CH2)nPPH2 (n = 1−4) and effect of ligand on ease of reductive elimination of C2H6 from NiMe2(Ph2P(CH2)nPPh2)
作者:Teiji Kohara、Takakazu Yamamoto、Akio Yamamoto
DOI:10.1016/s0022-328x(00)94431-0
日期:1980.6
Reactions of the dimethylnickel(II) complexes NiMe2L2 (L = bpy, PEt3 (bpy = 2,2′-bipyridine)) with diphosphines Ph2P(CH2)nPPh2 (n = 1−4) give NiMe2(Ph2P(CH2nPPh2) (n = 2,3) or produce ethane and Nio-diphosphine complexes (n = 1, 4), depending on the chain length of (CH2)n of the diphosphine ligand employed. The ligand exchange reaction between NiMe2 (bpy) and Ph2P(CH2)3PPh2 (dpp) proceeds through an
Substitution reactions of allyl alcohol derivatives 1a–c with diethylamine, phenol and dimethyl malonate are efficiently carried out in the presence of Ni(dppb)2(dppb = 1,2-diphenylphosphinobutane) as catalyst and ammonium salts or bases as promoters or co-reagents.
Effect of the bite angle of diphosphine ligands on activity and selectivity in the nickel-catalysed hydrocyanation of styrene
作者:Mirko Kranenburg、Paul C. J. Kamer、Piet W. N. M. van Leeuwen、Dieter Vogt、Wilhelm Keim
DOI:10.1039/c39950002177
日期:——
The application of diphosphines with large bite angles (βn= 101-109°) in nickel catalysts leads to successful, regioselective hydrocyanation of styrene.
The reaction of a nickelalactone with dppm, resulting in the formation of a stable binuclear Ni(I) complex with an acrylate, a Ph2P− and a dppm bridge, models a key step in the formation of acrylic acid from CO2 and ethylene.
镍内酯与 dppm 的反应,导致与丙烯酸酯、Ph2P− 和 dppm 桥形成稳定的双核 Ni(I) 络合物,模拟了从 CO2 和乙烯形成丙烯酸的关键步骤。