1035559-75-1Relevant articles and documents
Synthesis and characterization of iron, cobalt, and nickel complexes bearing novel N,N-chelate ligands and their catalytic properties in ethylene oligomerization
Wang, Li,Zhang, Cheng,Wang, Zhong-Xia
, p. 2477 - 2487 (2008/02/10)
Treatment of o-ROC6H4NC (R = PhCH2, iPr) with [Li{2-CH(SiMe3)C5H4N}] afforded dimeric lithium complexes [Li{N(o-ROC6H4)C(SiMe 3)CH(2-C5H4N)}]2 (3, R = PhCH 2; 4, R = iPr). Reaction of the hthium complexes with 1 equiv. of (dme)NiCl2 gave nickel complexes [Ni{N(o-ROC6H 4)-C(SiMe3)CH(2-C5H4N)} 2] (5, R = PhCH2; 6, R = iPr). The stoichiometric reaction of complexes 3 and 4 with Et3NH+Cl- formed 2-{o-ROC6H4NHC(SiMe3)CH}C5H 4N (7, R = PhCH2; 8, R = iPr) in quantitative yields. Reaction of 7 or 8 with metal halides, including (dme)NiCl2, NiBr2, FeCl2·4H2O, and CoCl2 yielded complexes [MX2{(o-ROC6H4)N=C(SiMe 3)CH2(2-C5H4N)}] (9, R = PhCH 2, M = Ni, X = Cl; 10, R = iPr, M = Ni, X = Cl; 11, R = PhCH 2, M = Ni, X = Br; 12, R = iPr, M = Ni, X = Br; 13, R = PhCH 2, M = Fe, X = Cl; 14, R = iPr, M = Fe, X = Cl; 15, R = PhCH 2, M = Co, X = Cl; 16, R = iPr, M = Co, X = Cl). For comparasion, nickel and cobalt complexes [MX2{(o-MeC6H 4)N=C(SiMe3)CH2(2-C5H 4N)}] (M = Ni, X = Br, 18; M = Co, X = Cl, 19) were similarly synthesized through reaction of 2-{o-MeC6H4NHC(SiMe 3)CH}C5H4N (17) with NiBr2 and CoCl2, respectively. These compounds were characterized by NMR (for 3, 4, 7, 8, and 17) and IR (for 5-19) spectroscopy, elemental analyses and HRMS (for 5, 6, and 9-19). The molecular structures of complexes 3, 6, 12, and 14 were characterized by single-crystal X-ray diffraction techniques. The catalytic behavior in ethylene oligomerization of complexes 5, 6, 9-16, 18, and 19 was investigated. Under optimal conditions, the complexes showed good catalytic activities upon activation with appropriate aluminum co-catalysts (8.72 × 102 to 18.2 × 102 kg/mol h atm for the nickel complexes upon activation with Et2AlCl and 4.3 × 102 to 8.1 × 102 kg/mol h atm for the iron and cobalt complexes upon activation with MMAO). Wiley-VCH Verlag GmbH & Co. KGaA, 2007.
