title: Well-defined silica-supported olefin metathesis catalysts.
abstract: Two triethoxysilyl-functionalized N-heterocyclic carbene ligands have been synthesized and used to prepare the corresponding second-generation ruthenium olefin metathesis catalysts. These complexes were then grafted onto silica gel, and the resulting materials were efficient heterogeneous catalysts for a number of metathesis reactions. The solid-supported catalysts were shown to be recyclable over a number of reaction cycles, and no detectable levels of ruthenium were observed in reaction filtrates (ruthenium concentration of filtrate <5 ppb).
authors.affiliation: The Arnold and Mabel Beckman Laboratory of Chemical Synthesis, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.
authors.forename: Daryl P
authors.initials: DP
authors.lastname: Allen
authors.forename: Matthew M
authors.initials: MM
authors.lastname: Van Wingerden
authors.forename: Robert H
authors.initials: RH
authors.lastname: Grubbs