Isostructural Molecular and Surface Mimics of the
Active Sites of the Industrial WO<sub>3</sub>/SiO<sub>2</sub> Metathesis
Catalysts
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Abstract
In
classical, ill-defined WO<sub>3</sub>/SiO<sub>2</sub> alkene
metathesis catalysts, isolated, silica-supported tungsten oxo alkylidene
species are suspected to represent the catalytically active species.
Here, we report the synthesis and the characterization of molecular
and supported isostructural mimics of these active sites. The good
activities at room temperature of these well-defined oxo alkylidene
complexes indicate that the lower activity of WO<sub>3</sub>/SiO<sub>2</sub>, even after preactivation, is likely due to the difficulty
to generate active alkylidene sites from W oxo species in the classical
system