23777-40-4Relevant articles and documents
Nickel-Catalyzed Formation of 1,3-Dienes via a Highly Selective Cross-Tetramerization of Tetrafluoroethylene, Styrenes, Alkynes, and Ethylene
Kawashima, Takuya,Ohashi, Masato,Ogoshi, Sensuke
, p. 17795 - 17798 (2017)
In the presence of a catalytic amount of Ni(cod)2 (cod = 1,5-cyclooctadiene) and PCy3 (Cy = cyclohexyl), the cross-tetramerization of tetrafluoroethylene (TFE), alkynes, and ethylene occurred in a highly selective manner to afford a variety of 1,3-dienes with a 3,3,4,4-tetrafluorobutyl chain. In addition, a Ni(0)-catalyzed cross-tetramerization of TFE, alkynes, ethylene, and styrenes was developed. These catalytic reactions might proceed via partially fluorinated five- and seven-membered nickelacycle key intermediates.
Capping nido-Nonagermanide Clusters with M-PPh3 and Dynamics in Solution: Synthesis and Structure of closo-[(Me3Si)3Si]3Et[Ge9 M](PPh3) (M = Ni, Pt)
Frischhut, Sabine,Kaiser, Felix,Klein, Wilhelm,Drees, Markus,Kühn, Fritz E.,F?ssler, Thomas F.
, p. 4560 - 4567 (2019/01/08)
In this work, cluster expansion of nine-atomic germanium clusters with nickel and platinum atoms is reported. The compounds [(Me3Si)3Si]3Et[Ge9Ni](PPh3) and [(Me3Si)3Si]3Et[Ge9Pt](PPh3) are characterized by NMR spectroscopy, elemental analysis, and single crystal X-ray structure analysis. The latter represents the first intermetalloid Ge-Pt cluster with a platinum atom as part of a deltahedron. So far, only one compound of this type has been reported for the homologous Pd. Hence, with these new compounds, metal-coordinated deltahedral Ge9 clusters are now known for the whole triad of group 10 elements. The cluster compounds are accessible by treating [(Me3Si)3Si]3EtGe9 with η2-ethylene-bis-(triphenylphosphine)-nickel(0) and η2-ethylene-bis-(triphenylphosphine)-platinum(0), respectively, in toluene. The crystal structure determination reveals ten-vertex-closo-[Ge9M]-cluster cores (M = Ni, Pt) bearing five exo-bonded ligands. Unlike the nine-vertex-cluster [(Me3Si)3Si]3EtGe9, the penta-functionalized platinum containing cluster compound [(Me3Si)3Si]3Et[Ge9Pt](PPh3) does not show fluctuating behavior in solution over a wide temperature range on the NMR time scale, whereas the [(Me3Si)3Si]3Et[Ge9Ni](PPh3) shows highly dynamic processes in solution at ambient temperature.
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).
Isomerization of a vinylcyclobutene to a cyclohexadiene: A nickel(I)-promoted rearrangement
Choi, Heajin,Hershberger, James W.,Pinhas, Allan R.,Ho, Douglas M.
, p. 2930 - 2936 (2008/10/08)
The nickel-promoted isomerization of a 3-vinylcyclobutene to the corresponding 1,4-cyclohexadiene was studied by using (PPh3)2Ni(C2H4) as the nickel source. Through the use of chemical and electrochemical experiments, it was determined that nickel(I) and not nickel(0) promotes this isomerization reaction at room temperature. The corresponding platinum-vinylcyclobutene complex 4 has been characterized by a single-crystal X-ray diffraction study: C46H42O4P2Pt, monoclinic, P21/n, with a = 10.774 (1) ?, b = 20.281 (4) ?, c = 18.297 (2) ?, β = 97.37 (1)°, Z = 4, R(F) = 0.0378, and Rw(F) = 0.0371.
Zur Lewisaciditat von Nickel(0) VII. Alkalimetall-μ3-hydrido-tetrakis(ethen)diniccolat(0)-Komplexe: (pmdta)Li(μ3-H)Ni2(C2H4)4 und (pmdta)Na(μ3-H)Ni2(C2H4)4
Porschke, Klaus Richard,Wilke, Gunther
, p. 257 - 262 (2007/10/02)
Ni(C2H4)3 reacts with alkalimetal hydridoaluminates or -gallates MAHA1/GaR3 and MAH2AlR2 (R = alkyl) in ether/pmdta at temperatures between -70 and -20 oC to yield the ion pair complexes (pmdta)MA(μ3-
