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Chromium‐Based Ethylene Tetramerization Catalysts Supported by Silicon‐Bridged Diphosphine Ligands: Further Combination of High Activity and Selectivity
Author(s) -
Zhang Le,
Meng Xuejiao,
Chen Yanhui,
Cao Chengang,
Jiang Tao
Publication year - 2017
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201600941
Subject(s) - methylcyclohexane , ethylene , selectivity , chemistry , dimethylsilane , catalysis , chromium , 1 octene , silicon , intramolecular force , solvent , crystallography , polymer chemistry , medicinal chemistry , stereochemistry , organic chemistry
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 4.2×10 6 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 C 6 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.