title: Hoveyda-Grubbs type metathesis catalyst immobilized on mesoporous molecular sieves MCM-41 and SBA-15.
abstract: A commercially available Hoveyda-Grubbs type catalyst (RC303 Zhannan Pharma) was immobilized on mesoporous molecular sieves MCM-41 and on SBA-15 by direct interaction with the sieve wall surface. The immobilized catalysts exhibited high activity and nearly 100% selectivity in several types of alkene metathesis reactions. Ru leaching was found to depend on the substrate and solvent used (the lowest leaching was found for ring-closing metathesis of 1,7-octadiene in cyclohexane - 0.04% of catalyst Ru content). Results of XPS, UV-vis and NMR spectroscopy showed that at least 76% of the Ru content was bound to the support surface non-covalently and could be removed from the catalyst by washing with THF.
authors.affiliation: J. Heyrovský Institute of Physical Chemistry of AS CR, v.v.i, Dolejškova 3, 182 23 Prague 8, Czech Republic.
authors.forename: Hynek
authors.initials: H
authors.lastname: Balcar
authors.forename: Tushar
authors.initials: T
authors.lastname: Shinde
authors.forename: Naděžda
authors.initials: N
authors.lastname: Zilková
authors.forename: Zdeněk
authors.initials: Z
authors.lastname: Bastl