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. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of the American Chemical Society Année : 2014

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.

Résumé

The synthesis and full characterization of a well-defined silica-supported ≡Si-O-W(Me)5 species is reported. Under an inert atmosphere, it is a stable material at moderate temperature, whereas the homoleptic parent complex decomposes above -20 °C, demonstrating the stabilizing effect of immobilization of the molecular complex. Above 70 °C the grafted complex converts into the two methylidyne surface complexes [(≡SiO-)W(≡CH)Me2] and [(≡SiO-)2W(≡CH)Me]. All of these silica-supported complexes are active precursors for propane metathesis reactions.
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Dates et versions

hal-00954538 , version 1 (03-03-2014)

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Manoja K Samantaray, Emmanuel Callens, Edy Abou-Hamad, Aaron J. Rossini, Cory M Widdifield, et al.. 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.. Journal of the American Chemical Society, 2014, 136 (3), pp.1054-1061. ⟨10.1021/ja410747g⟩. ⟨hal-00954538⟩
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