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

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• 作者：Dr. Le Zhang ; Xuejiao Meng ; Yanhui Chen ; Chengang Cao and Tao Jiang
• 刊名：ChemCatChem
• 出版年：2017
• 出版时间：January 9, 2017
• 年：2017
• 卷：9
• 期：1
• 页码：76-79
• 全文大小：567K
• ISSN：1867-3899

文摘

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 4.2×10⁶ g (mol_Cr h)⁻¹ and a high selectivity of 78.44 % towards valuable 1-octene by using methylcyclohexane as the solvent at an ethylene pressure of 4.0 MPa and 45 °C. An intramolecular β-H transfer mechanism was proposed to explain the unequal molar proportions of cyclic C₆ byproducts. The crystal structure data of two complexes proved that the SBDP system with a wide P−Cr−P bite angle could also exhibit superior performance in the tetramerization of ethylene.