期刊
ORGANOMETALLICS
卷 28, 期 7, 页码 2127-2133出版社
AMER CHEMICAL SOC
DOI: 10.1021/om8006322
关键词
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资金
- National Research Foundation
- Department of Science and Technology
- Center of Excellence in Catalysis (NRF-DST, c*change)
- University of Johannesburg (South Africa)
The reactions of 2,6-bis(3,5-dimethylpyrazol-1-ylmethyl)pyridine (L1) and 2,6-bis(3,5-di-tert-butylpyrazol-1-ylmethyl)pyridine (L2) with NiCl2 or NiBr2 gave the nickel(II) complexes [NiCl2(L1)] (1), [NiBr2(L1)] (2), [NiCl2(L2)] (3), and [NiBr2(L2)] (4) in high yields. Compounds 2-(3,5-dimethylpyrazol- l-ylmethyl)pyridine (L3) and 2-(3,5-di-tert-butylpyrazol-l-ylmethyl)pyridine (L4) on the other hand gave either mononuclear or dinuclear nickel(II) complexes, depending on the steric bulk of the substituents on the pyrazolyl unit. While L3 gave the dinuclear complexes [Ni-2(mu(2)-Cl)(2)Cl-2(L3)(2)] (5) and [Ni-2(mu Br2-)(2)Br-2(L3)(2)] (6), L4 gave the mononuclear complexes [NiCl2(L4)] (7) and [NiBr2(L4)] (8). Activation of 1-8 with EtAlCl2 resulted in the oligomerization of ethylene to C-4, C-6, and C-8 alkenes, followed by subsequent Friedel-Crafts alkylation of the toluene solvent. Activities as high as 15 660 kg of alkylated products/mol Ni/h were observed for 5 at 40 bar. However, when hexane was used as solvent, only trace amounts of alkylated toluene products were observed.
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