Ethylene oligomerization promoted by nickel-based catalysts with silicon-bridged diphosphine amine ligands


A series of nickel complexes [Ni(L1)Br2] (C1), [Ni(L2)Br2] (C2) and [Ni(L3)Br2] (C3) (L1 = N-isopropyl-N-(((diphenylphosphanyl)methyl)dimethylsilyl)-1,1-diphenylphosphanamine, L2 = N-cyclopentyl-N-(((diphenylphosphanyl)methyl)dimethylsilyl)-1,1-diphenylphosphanamine, L3 = N-(2,6-diisopropylphenyl)-N-(((diphenylphosphanyl)methyl)dimethylsilyl)-1,1-diphenylphosphanamine) were synthesized and characterized by elemental analysis, mass spectrometry, spectroscopy and single-crystal X-ray diffraction. L1, L2 and L3 each act as bidentate ligands. Upon activation with ethylaluminum dichloride, these complexes produce efficient catalytic systems for selective dimerization of ethylene to 1-butene, with catalytic activities of 3.45 × 107 g/(molNi·h) and 95.6% butene selectivity containing 87.6% 1-butene fraction.

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This study was supported by the National Key Research and Development Program of China (2017YFB0306700). The Natural Science Foundation of Tianjin City (14JCYBJC23100, 15JCYBJC48100 and 16JCZDJC31600).

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Correspondence to Tao Jiang.

Electronic supplementary material

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CCDC numbers 1859463 and 1859467 contain the supplementary crystallographic data for and C3. The data can be obtained free of charge from the Cambridge Crystallographic Data Centre via (DOC 3155 kb)

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Wei, W., Yu, B., Alam, F. et al. Ethylene oligomerization promoted by nickel-based catalysts with silicon-bridged diphosphine amine ligands. Transit Met Chem 44, 125–133 (2019).

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