Chromium-Based Ethylene Tetramerization Catalysts Supported by Silicon-Bridged Diphosphine Ligands: Further Combination of High Activity and Selectivity

作者：Zhang, Le; Meng, Xuejiao; Chen, Yanhui; Cao, Chengang; Jiang, Tao^*

来源：ChemCatChem, 2017, 9(1): 76-79.

DOI：10.1002/cctc.201600941

• MECHANISTIC INVESTIGATIONS
• TRI-/TETRAMERIZATION
• OLIGOMERIZATION
• TRIMERIZATION
• 1-OCTENE

A series of silicon-bridged diphosphine (SBDP) ligands were synthesized and characterized. The Cr precatalyst supported by bis(diphenylphosphinomethyl) dimethylsilane achieved a high activity of 4.2 V 10(6) g(mol(Cr) h) (- 1) and a high selectivity of 78.44% towards valuable 1-octene by using methylcyclohex-ane as the solvent at an ethylene pressure of 4.0 MPa and 45 degrees C. An intramolecular beta-H transfer mechanism was proposed to explain the unequal molar proportions of cyclic C-6 byprod-ucts. The crystal structure data of two complexes proved that the SBDP system with a wide P-Cr-P bite angle could also ex-hibit superior performance in the tetramerization of ethylene.

• 出版日期2017-1
• 单位天津科技大学; 邯郸学院