Linker-Free, Silica-Bound Olefin-Metathesis Catalysts: Applications in Heterogeneous Catalysis (pages 14717–14724)
Dr. José Cabrera, Dr. Robin Padilla, Dr. Miriam Bru, Dr. Ronald Lindner, Dr. Takeharu Kageyama, Dr. Kristina Wilckens, Dr. Shawna L. Balof, Dr. Hans-Jörg Schanz, Dr. Richard Dehn, Dr. J. Henrique Teles, Dr. Stephan Deuerlein, Dr. Kevin Müller, Dr. Frank Rominger and Dr. Michael Limbach
Article first published online: 27 SEP 2012 | DOI: 10.1002/chem.201202248
Born free: Silica adsorption of ruthenium carbenes with the H2ITap ligand (see figure) yielded heterogeneous materials without the need for tethering groups on the complex or the support. These materials were tested as catalysts in the ring-opening–ring-closing-metathesis of cyclooctene and the cross-metathesis of methyl oleate under continuous-flow conditions. The best complexes showed a TON>4000, which surpasses the most active silica-based materials.