WMe6 Tamed by Silica: ≡Si–O–WMe5 as an Efficient, Well-Defined Species for Alkane Metathesis, Leading to the Observation of a Supported W–Methyl/Methylidyne Species

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• 作者：Manoja K. Samantaray ; Emmanuel Callens ; Edy Abou-Hamad ; Aaron J. Rossini ; Cory M. Widdifield ; Raju Dey ; Lyndon Emsley ; Jean-Marie Basset
• 刊名：Journal of the American Chemical Society
• 出版年：2014
• 出版时间：January 22, 2014
• 年：2014
• 卷：136
• 期：3
• 页码：1054-1061
• 全文大小：378K
• ISSN：1520-5126

文摘

The synthesis and full characterization of a well-defined silica-supported 鈮i鈥揙鈥揥(Me)₅ species is reported. Under an inert atmosphere, it is a stable material at moderate temperature, whereas the homoleptic parent complex decomposes above 鈭?0 掳C, demonstrating the stabilizing effect of immobilization of the molecular complex. Above 70 掳C the grafted complex converts into the two methylidyne surface complexes [(鈮iO鈭?W(鈮H)Me₂] and [(鈮iO鈭?₂W(鈮H)Me]. All of these silica-supported complexes are active precursors for propane metathesis reactions.