title: Ru complexes of Hoveyda-Grubbs type immobilized on lamellar zeolites: activity in olefin metathesis reactions.
abstract: Hoveyda-Grubbs type catalysts with cationic tags on NHC ligands were linker-free immobilized on the surface of lamellar zeolitic supports (MCM-22, MCM-56, MCM-36) and on mesoporous molecular sieves SBA-15. The activity of prepared hybrid catalysts was tested in olefin metathesis reactions: the activity in ring-closing metathesis of citronellene and N,N-diallyltrifluoroacetamide decreased in the order of support MCM-22 ≈ MCM-56 > SBA-15 > MCM-36; the hybrid catalyst based on SBA-15 was found the most active in self-metathesis of methyl oleate. All catalysts were reusable and exhibited low Ru leaching (<1% of Ru content). XPS analysis revealed that during immobilization ion exchange between Hoveyda-Grubbs type catalyst and zeolitic support occurred in the case of Cl(-) counter anion; in contrast, PF6 (-) counter anion underwent partial decomposition.
authors.affiliation: J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, v.v. i. Dolejškova 2155/3, 182 23 Prague 8, Czech Republic.
authors.forename: Hynek
authors.initials: H
authors.lastname: Balcar
authors.affiliation: J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, v.v. i. Dolejškova 2155/3, 182 23 Prague 8, Czech Republic.
authors.forename: Naděžda
authors.initials: N
authors.lastname: Žilková
authors.affiliation: J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, v.v. i. Dolejškova 2155/3, 182 23 Prague 8, Czech Republic.
authors.forename: Martin
authors.initials: M
authors.lastname: Kubů
authors.affiliation: J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, v.v. i. Dolejškova 2155/3, 182 23 Prague 8, Czech Republic.
authors.forename: Michal
authors.initials: M
authors.lastname: Mazur
authors.affiliation: J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, v.v. i. Dolejškova 2155/3, 182 23 Prague 8, Czech Republic.
authors.forename: Zdeněk
authors.initials: Z
authors.lastname: Bastl
authors.affiliation: J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, v.v. i. Dolejškova 2155/3, 182 23 Prague 8, Czech Republic.
authors.forename: Jiří
authors.initials: J
authors.lastname: Čejka
keywords: Hoveyda–Grubbs type catalyst; hybrid catalysts; lamellar zeolites; non-covalent immobilization; olefin metathesis