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
M.K. Samantaray, E. Callens, E. Abou-Hamad, A.J. Rossini, C.M. Widdifield, R. Dey, L. Emsley, J.-M. Basset
J. Am. Chem. Soc., 136, 1054-1061, (2014)
Methylidyne species, Homoleptic parent
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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