title: Linker-free, silica-bound olefin-metathesis catalysts: applications in heterogeneous catalysis.
abstract: A set of heterogenized olefin-metathesis catalysts, which consisted of Ru complexes with the H(2)ITap ligand (1,3-bis(2',6'-dimethyl-4'dimethyl aminophenyl)-4,5-dihydroimidazol-2-ylidene) that had been adsorbed onto a silica support, has been prepared. These complexes showed strong binding to the solid support without the need for tethering groups on the complex or functionalized silica. The catalysts were tested in the ring-opening-ring-closing-metathesis (RO-RCM) of cyclooctene (COE) and the self-metathesis of methyl oleate under continuous-flow conditions. The best complexes showed a TON>4000, which surpasses the previously reported materials that were either based on the Grubbs-Hoveyda II complex on silica or on the classical heterogeneous Re(2)O(7)/B(2)O(3) catalyst.
authors.affiliation: Catalysis Research Laboratory, Heidelberg, Germany.
authors.forename: José
authors.initials: J
authors.lastname: Cabrera
authors.forename: Robin
authors.initials: R
authors.lastname: Padilla
authors.forename: Miriam
authors.initials: M
authors.lastname: Bru
authors.forename: Ronald
authors.initials: R
authors.lastname: Lindner
authors.forename: Takeharu
authors.initials: T
authors.lastname: Kageyama
authors.forename: Kristina
authors.initials: K
authors.lastname: Wilckens
authors.forename: Shawna L
authors.initials: SL
authors.lastname: Balof
authors.forename: Hans-Jörg
authors.initials: HJ
authors.lastname: Schanz
authors.forename: Richard
authors.initials: R
authors.lastname: Dehn
authors.forename: J Henrique
authors.initials: JH
authors.lastname: Teles
authors.forename: Stephan
authors.initials: S
authors.lastname: Deuerlein
authors.forename: Kevin
authors.initials: K
authors.lastname: Müller
authors.forename: Frank
authors.initials: F
authors.lastname: Rominger
authors.forename: Michael
authors.initials: M
authors.lastname: Limbach