title: Switching on the Metathesis Activity of Re Oxo Alkylidene Surface Sites through a Tailor-Made Silica-Alumina Support.
abstract: Re oxo alkylidene surface species are putative active sites in classical heterogeneous Re-based alkene-metathesis catalysts. However, the lack of evidence for such species questions their existence and/or relevance as reaction intermediates. Using Re(O)(=CH-CH=CPh2)(OtBuF6)3(THF), the corresponding well-defined Re oxo alkylidene surface species can be generated on both silica and silica-alumina supports. While inactive on the silica support, it displays very good activity, even for functionalized olefins, on the silica-alumina support.
authors.affiliation: Department of Chemistry and Applied Biosciences, Vladimir Prelog Weg 1-5, 8093, Zürich, Switzerland.
authors.forename: Maxence
authors.initials: M
authors.lastname: Valla
authors.affiliation: Department of Chemistry and Applied Biosciences, Vladimir Prelog Weg 1-5, 8093, Zürich, Switzerland.
authors.forename: David
authors.initials: D
authors.lastname: Stadler
authors.affiliation: Department of Chemistry and Applied Biosciences, Vladimir Prelog Weg 1-5, 8093, Zürich, Switzerland.
authors.forename: Victor
authors.initials: V
authors.lastname: Mougel
authors.affiliation: Department of Chemistry and Applied Biosciences, Vladimir Prelog Weg 1-5, 8093, Zürich, Switzerland. ccoperet@inog.chem.ethz.ch.
authors.forename: Christophe
authors.initials: C
authors.lastname: Copéret
keywords: alumina; metathesis; oxo alkylidene; rhenium; supported catalysts