Abstract:The homologation of alkanes via alkane metathesis is catalyzed at low temperatures (150 °C) by the silica‐supported species (≡SiO)WMe5 and (≡SiO)TaMe4, while (≡SiO)TaMe3Cp* is inactive. The contrasting reactivity is paralleled by differences in the 13C NMR signature; the former display significantly more deshielded isotropic chemical shifts (δiso) and almost axially symmetric chemical shift tensors, similar to what is observed in their molecular precursors TaMe5 and WMe6. Analysis of the chemical shift tensors… Show more
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