Phosphanyl Methanimine (PCN) Ligands for the Selective Trimerization/Tetramerization of Ethylene with Chromium

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• 作者：James E. Radcliffe ; Andrei S. Batsanov ; David M. Smith ; John A. Scott ; Philip W. Dyer ; Martin J. Hanton
• 刊名：ACS Catalysis
• 出版年：2015
• 出版时间：December 4, 2015
• 年：2015
• 卷：5
• 期：12
• 页码：7095-7098
• 全文大小：294K
• ISSN：2155-5435

文摘

1-Phosphanyl methanimine ligands, R₂P鈥揅(Ph)鈺怤R鈥? may be prepared via a modular, convergent synthesis in good overall yield. Coordination chemistry studies with chromium confirm that they bind in a bidentate 魏²-P,N mode. In combination with chromium and an activator, these ligands promote the selective oligomerization of ethylene to 1-hexene and 1-octene with high activity. Notably, an exceptionally high liquid fraction selectivity to saleable products (1-hexene + 1-octene) is observed (>95%), along with a potent ligand dependence, such that selectivity can be varied from pure trimerization through to mixed trimerisation/tetramerisation with a 1-octene:1-hexene (OTH) ratio of 1.7.