Well-Defined Molybdenum Oxo Alkyl Complex Supported on Silica by Surface Organometallic Chemistry: A Highly Active Olefin Metathesis Precatalyst

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• 作者：Nicolas Merle ; Frédéric Le Quéméner ; Yassine Bouhoute ; Kai C. Szeto ; Aimery De Mallmann ; Samir Barman ; Manoja K. Samantaray ; Laurent Delevoye ; Régis M. GauvinMostafa Taoufik ; Jean-Marie Basset
• 刊名：Journal of the American Chemical Society
• 出版年：2017
• 出版时间：February 15, 2017
• 年：2017
• 卷：139
• 期：6
• 页码：2144-2147
• 全文大小：292K
• ISSN：1520-5126

文摘

The well-defined silica-supported molybdenum oxo alkyl species (≡SiO−)MoO(CH₂^tBu)₃ was selectively prepared by grafting of MoO(CH₂^tBu)₃Cl onto partially dehydroxylated silica (silica₇₀₀) using the surface organometallic chemistry approach. This surface species was fully characterized by elemental analysis and DRIFT, solid-state NMR, and EXAFS spectroscopy. This new material is related to the active species of industrial supported MoO₃/SiO₂ olefin metathesis catalysts. It displays very high activity in propene self-metathesis at mild (turnover number = 90 000 after 25 h). Remarkably, its catalytic performance outpaces those of the parent imido derivative and its tungsten oxo analogue.