Well-Defined Supported Mononuclear Tungsten Oxo Species as Olefin Metathesis Pre-Catalysts

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• 作者：Yassine Bouhoute ; Anthony Garron ; Denys Grekov ; Nicolas Merle ; Kai C. Szeto ; Aimery De Mallmann ; Iker Del Rosal ; Laurent Maron ; Guillaume Girard ; R茅gis M. Gauvin ; Laurent Delevoye ; Mostafa Taoufik
• 刊名：ACS Catalysis
• 出版年：2014
• 出版时间：November 7, 2014
• 年：2014
• 卷：4
• 期：11
• 页码：4232-4241
• 全文大小：476K
• ISSN：2155-5435

文摘

[WOCl₄] was grafted on silica dehydroxylated at 200 掳C, and the structure of the surface species was elucidated by a combination of spectroscopic and theoretical methods, demonstrating the formation of [(鈮iO)₂WOCl₂] (1a) as the major species accompanied by minor monopodal species [(鈮iO)WOCl₃] (1b). Most noteworthy, EXAFS and ¹⁷O NMR combined to DFT calculations helped elucidate the structure of the surface species. Alkylation was performed using SnMe₄, affording methyl species that were also precisely characterized. The alkylated species achieved excellent performances in isobutene metathesis to 2,3-dimethylbutene.

Keywords:

metathesis; surface chemistry; tungsten; tin; alkylation