A well-defined silica-supported tungsten oxo alkylidene is a highly active alkene metathesis catalyst

Matthew P Conley; Victor Mougel; Dmitry V Peryshkov; William P Forrest Jr; David Gajan; Anne Lesage; Lyndon Emsley; Christophe Copéret; Richard R Schrock

doi:10.1021/ja410052u

A well-defined silica-supported tungsten oxo alkylidene is a highly active alkene metathesis catalyst

J Am Chem Soc. 2013 Dec 26;135(51):19068-70. doi: 10.1021/ja410052u. Epub 2013 Dec 13.

Authors

Matthew P Conley¹, Victor Mougel, Dmitry V Peryshkov, William P Forrest Jr, David Gajan, Anne Lesage, Lyndon Emsley, Christophe Copéret, Richard R Schrock

Affiliation

¹ Department of Chemistry and Applied Biosciences, ETH Zürich , Vladimir Prelog Weg 2, CH-8093 Zürich, Switzerland.

PMID: 24304004
DOI: 10.1021/ja410052u

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.