(Pyrazol-1-ylmethyl)pyridine Nickel Complexes: Ethylene Oligomerization and Unusual Friedel−Crafts Alkylation Catalysts
作者:Stephen O. Ojwach、Ilia A. Guzei、Letitia L. Benade、Selwyn F. Mapolie、James Darkwa
DOI:10.1021/om8006322
日期:2009.4.13
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-1-ylmethyl)pyridine (L3) and 2-(3,5-di-tert-butylpyrazol-1-ylmethyl)pyridine (L4) on the other hand
2,6-双(3,5-二甲基吡唑-1-基甲基)吡啶(L1)和2,6-双(3,5-二叔丁基吡唑-1-基甲基)吡啶(L2)2或NiBr 2生成镍(II)络合物[NiCl 2(L1)](1),[NiBr 2(L1)](2),[NiCl 2(L2)](3)和[NiBr 2(L2))](4)高产。化合物2-(3,5-二甲基吡唑-1-基甲基)吡啶(L3)和2-(3,5-二叔丁基另一方面,取决于吡唑基单元上取代基的空间体积,-丁基吡唑-1-基甲基)吡啶(L4)产生单核或双核镍(II)配合物。而L3,得到双核配合物[镍2(μ 2 -Cl)2氯2(L3)2 ](5)和[镍2(μ 2 -Br)2溴2(L3)2 ](6),L4,得到单核络合物[NiCl 2(L4)](7)和[NiBr 2(L4)](8)。的活化1 - 8与EtAlCl 2导致乙烯低聚至C 4,C 6和C 8支链烯烃,然后将甲苯溶剂的后续的Friedel-Crafts烷基化反应。在40