Nickel complexes incorporating pyrazole-based ligands for ethylene dimerization to 1-butylene
摘要:
In this study we synthesized and characterized bis(3,5-dimethylpyrazolyl)dimethylsilane (L1) and bis(3,5-dimethylpyrazolyl) phenylphosphine (L2) and then prepared bidentate (N boolean AND N) nickel complexes by reacting L1 or L2 with NiBr2(DME). In combination with methylaluminoxane, diethylchloroaluminum or ethyldichloroaluminum (EADC) as co-catalyst, L1/Ni and L2/Ni complexes exhibited moderate catalytic activities (240-1310 kg/mol(Ni) h) and high selectivities (up to 93.2%) for ethylene dimerization toward 1-butylene. The catalytic performance was substantially affected by the co-catalyst type and ligand environment, especially the bridge atom. (C) 2015 Elsevier B.V. All rights reserved.
Nickel complexes incorporating pyrazole-based ligands for ethylene dimerization to 1-butylene
摘要:
In this study we synthesized and characterized bis(3,5-dimethylpyrazolyl)dimethylsilane (L1) and bis(3,5-dimethylpyrazolyl) phenylphosphine (L2) and then prepared bidentate (N boolean AND N) nickel complexes by reacting L1 or L2 with NiBr2(DME). In combination with methylaluminoxane, diethylchloroaluminum or ethyldichloroaluminum (EADC) as co-catalyst, L1/Ni and L2/Ni complexes exhibited moderate catalytic activities (240-1310 kg/mol(Ni) h) and high selectivities (up to 93.2%) for ethylene dimerization toward 1-butylene. The catalytic performance was substantially affected by the co-catalyst type and ligand environment, especially the bridge atom. (C) 2015 Elsevier B.V. All rights reserved.