文献类型：期刊文献

英文题名：Selective Ethylene Oligomerization with Chromium Complexes Bearing Pyridine-Phosphine Ligands: Influence of Ligand Structure on Catalytic Behavior

作者：Yang, Yun[1,2];Gurnham, Joanna[3];Liu, Boping[2];Duchateau, Robbert[1];Ganabarotta, Sandro[3];Korobkov, Ilia[4]

机构：[1]Eindhoven Univ Technol, Dept Chem Engn & Chem, NL-5600 MB Eindhoven, Netherlands;[2]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[3]Univ Ottawa, Dept Chem, Ottawa, ON K1N 6N5, Canada;[4]Univ Ottawa, Xray Core Facil, Fac Sci, Ottawa, ON K1N 6N5, Canada

年份：2014

卷号：33

期号：20

起止页码：5749

外文期刊名：ORGANOMETALLICS

收录：;EI(收录号：20144600184542);WOS:【SCI-EXPANDED(收录号:WOS:000343849700017)】；

基金：We'd like to thank the Chinese Scholarship Council, the Natural Science Foundation of China (No. 21004020 and No. 21174037), and the Eindhoven University of Technology for financial support.

语种：英文

外文关键词：Oligomerization - Phosphorus compounds - Catalyst activity - Chromium compounds - Organic solvents - Synthesis (chemical) - Chlorine compounds - Ethylene - Ligands - Oligomers

摘要：Chromium complexes bearing a series of pyridinephosphine ligands have been synthesized and examined for their catalytic behavior in ethylene oligomerization. The choice of solvent, toluene versus methylcyclohexane, shows a pronounced influence on the catalytic activity for all these complexes. Variations of the ligand system have been introduced by modifying the phosphine substituents affecting ligand bite angles and flexibility. It has been demonstrated that minor differences in the ligand structure can result in remarkable changes not only in catalytic activity but also in selectivity toward a-olefins versus polyethylene and distribution of oligomeric products. Ligand PyCH2N(Me)(PPr2)-Pr-i, in combination with CrCl3(THF)(3) afforded selective ethylene tri- and tetramerization, giving 1-hexene and 1-octene with good overall selectivity and high purity, albeit with the presence of small amounts of PE.