A Well-Defined
Silica-Supported Tungsten Oxo Alkylidene
Is a Highly Active Alkene Metathesis Catalyst
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Abstract
Grafting
(ArO)<sub>2</sub>W(O)(CHtBu) (ArO = 2,6-mesitylphenoxide)
on partially dehydroxylated silica forms mostly [(SiO)W(O)(CHtBu)(OAr)]
along with minor amounts of [(SiO)W(O)(CH<sub>2</sub>tBu)(OAr)<sub>2</sub>] (20%), both fully characterized by elemental
analysis and IR and NMR spectroscopies. The well-defined oxo alkylidene
surface complex [(SiO)W(O)(CHtBu)OAr] is among
the most active heterogeneous metathesis catalysts reported to date
in the self-metathesis of <i>cis</i>-4-nonene and ethyl
oleate, in sharp contrast to the classical heterogeneous catalysts
based on WO<sub>3</sub>/SiO<sub>2</sub>
