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- W2556028175 abstract "Reactions of 2-bromo-6-(3,5-dimethyl-1H-pyrazol-1-yl)pyridine (L1) and 2,6-bis(3,5-dimethyl-1H-pyrazol-1-yl)pyridine (L2) with NiCl2 and NiBr2 led to the formation of their respective metal complexes [NiCl2(L1)] (1), [NiBr2(L1)] (2) and [NiBr2(L2)] (3) in moderate to high yields. The complexes were characterized using elemental analyses, mass spectrometry and single-crystal X-ray diffraction for 2. The solid-state structure of 2 confirmed the bidentate coordination mode of L1 and formation of a monometallic compound. Activation of the nickel(II) pre-catalysts with methylaluminoxane afforded active catalysts in the ethylene oligomerization reaction to produce mainly butenes (84–86%). In contrast, activation of nickel(II) pre-catalyst 2 with ethylaluminium dichloride resulted in partial Friedel–Crafts alkylation of the toluene solvent by the preformed oligomers. Complex structure, nature of co-catalyst employed, type of solvent and reaction conditions influenced the catalytic behaviour of these pre-catalysts. Copyright © 2015 John Wiley & Sons, Ltd." @default.
- W2556028175 created "2016-11-30" @default.
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- W2556028175 date "2015-11-16" @default.
- W2556028175 modified "2023-10-01" @default.
- W2556028175 title "Nickel(II) complexes bearing pyrazolylpyridines: synthesis, structures and ethylene oligomerization reactions" @default.
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- W2556028175 doi "https://doi.org/10.1002/aoc.3402" @default.
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