Organometallics · 2006 · 153 citations · 24 references
Natural SciencesChemistryMaterials ScienceCatalysisSurface ChemistrySurface ScienceCatalysis At SurfacesCatalytic MaterialsSupported CatalystsSurface CatalysisSurface ReactionsSurface ReactivityCatalyst Surface StructureCatalyst SurfacesCatalytic Surface ReactionsMass Balance AnalysisMetathesis CatalysisOlefin MetathesisOlefin Metathesis CatalysisSurface Complexation
The reaction of [W( NAr)( CH t Bu)(CH 2 t Bu) 2 ] ( 1; Ar = 2,6- i PrC 6 H 3 ) with a silica partially dehydroxylated at 700 °C, SiO 2 - (700), gives syn- [(⋮SiO)W( NAr)( CH t Bu)(CH 2 t Bu)] ( 2 ) as a major surface species, which was fully characterized by mass balance analysis, IR, NMR, EXAFS, and DFT periodic calculations. Similarly, complex 1 reacts with [( c -C 5 H 9 ) 7 Si 7 O 12 SiOH] to give [(SiO)W( NAr)( CH t Bu)(CH 2 t Bu)] ( 2m ), which shows similar spectroscopic properties. Surface complex 2 is a highly active propene metathesis catalyst, which can achieve a TON of 16 000 within 100 h, with only a slow deactivation.
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