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

Zhang Le | Zendy; Meng Xuejiao | Zendy; Chen Yanhui | Zendy; Cao Chengang | Zendy; Jiang Tao | Zendy

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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.

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