52193-12-1Relevant academic research and scientific papers
Synthesis and reactions of nickel(0) η2-cyclohexyne complexes and X-ray crystal structure of Ni(η2-C6H8)(C6H 11)2PCH2CH2P(C6H 11)2
Bennett, Martin A.,Johnson, Julian A.,Willis, Anthony C.
, p. 68 - 74 (2008/10/08)
Reduction of 1,2-dibromocyclohexene with 1% sodium amalgam in the presence of Ni(η2-C2H4)L2 gives cyclohexyne nickel(O) complexes Ni(η2-C6H8)L2 [L2 = 2PPh3 (1), dcpe (2), 2PEt3 (3); dcpe = 1,2-bis(dicyclohexylphosphino)ethane, Cy2PCH2CH2PCy2], which are structurally similar to, but less stable than, the corresponding platinum(O) compounds. The crystal structure of 2 has been determined. The molecule contains a nickel atom bound to η2-cyclohexyne [Ni-C(1) = 1.875(4) A?, Ni-C(2) = 1.867(4) A?] and to dcpe [Ni-P(1) = 2.139-(1) A?, Ni-P(2) = 2.138(1) A?]. The geometry is close to trigonal planar if the midpoint of the coordinated triple bond is regarded as occupying one coordination site, and the C=C distance [1.272(5) A?] is slightly less than that in Pt(η2-C6H8)(PPh3)2 [1.297(8) A?]. Complex 2 reacts with methyl iodide and with CO2 to give insertion products containing nickel(II), NiI(2-MeC6H8)(dcpe) (7) and Ni{C6H8C(O)O}(dcpe)(9), respectively. Dimethyl acetylenedicarboxylate inserts into the Ni-C σ-bond of 9 to give a seven-membered nickelacycle Ni{C(CO2-Me)=C(CO2Me)C6H 8C(O)C-(dcpe) (10).
Preparation of highly reactive metal powders. Preparation, characterization, and chemistry of iron, cobalt, nickel, palladium, and platinum microparticles
Kavaliunas, Arunas V.,Taylor, Ashley,Rieke, Reuben D.
, p. 377 - 383 (2008/10/08)
Anhydrous metal halides of iron, cobalt, nickel, palladium, and platinum are readily reduced in glyme or THF with lithium in the presence of a small amount of naphthalene and yield finely divided, black metal powders of exceptional reactivity. Metal powders of Fe and Co react with C6F5X (X = Br, I) to yield solvated M(C6F5)2 and MX2. Powders of palladium and platinum react with C6F5I to yield solvated M(C6F5)I (M = Pd, Pt). Nickel powder reacts with C6F5I to yield the solvated species Ni(C6F5)2 and NiI2, however, with C6F5Br the product is solvated Ni(C6F5)Br. In most cases the metal powders are sufficiently reactive that a stoichiometric amount of C6F5X to the metal powder is used. The coordinated ether of all of these organometallic compounds is exceptionally labile and is displaced with a variety of ligands: phosphines, amines, sulfides, isocyanides, diolefins, and carbon monoxide. Many of the resultant compounds are novel and most are obtained in high yields. Palladium metal powder to which has been added 2,2′-bipyridine (bpy) reacts with iodobenzene to yield Pd(C6H5)I(bpy). Surface analyses including ESCA and BET were carried out on the highly reactive Ni, Pt, and Pd metal powders.
