title: A well-defined silica-supported tungsten oxo alkylidene is a highly active alkene metathesis catalyst.
abstract: Grafting (ArO)2W(═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)(CH2tBu)(OAr)2] (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 cis-4-nonene and ethyl oleate, in sharp contrast to the classical heterogeneous catalysts based on WO3/SiO2.
authors.affiliation: Department of Chemistry and Applied Biosciences, ETH Zürich , Vladimir Prelog Weg 2, CH-8093 Zürich, Switzerland.
authors.forename: Matthew P
authors.initials: MP
authors.lastname: Conley
authors.forename: Victor
authors.initials: V
authors.lastname: Mougel
authors.forename: Dmitry V
authors.initials: DV
authors.lastname: Peryshkov
authors.forename: William P
authors.initials: WP
authors.lastname: Forrest
authors.forename: David
authors.initials: D
authors.lastname: Gajan
authors.forename: Anne
authors.initials: A
authors.lastname: Lesage
authors.forename: Lyndon
authors.initials: L
authors.lastname: Emsley
authors.forename: Christophe
authors.initials: C
authors.lastname: Copéret
authors.forename: Richard R
authors.initials: RR
authors.lastname: Schrock