Ru complexes of Hoveyda–Grubbs type immobilized on lamellar zeolites: activity in olefin metathesis reactions

• Hynek Balcar,
• Naděžda Žilková,
• Martin Kubů,
• Michal Mazur,
• Zdeněk Bastl and
• Jiří Čejka

Beilstein J. Org. Chem. 2015, 11, 2087–2096, doi:10.3762/bjoc.11.225

• 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. Keywords: Hoveyda–Grubbs type catalyst; hybrid catalysts; lamellar zeolites; non-covalent

• various co-substrates. The catalyst was reusable and Ru leaching was very low, not only in toluene (Ru content in product <10 ppm in most cases) but also in polar solvents (ethyl acetate, dichloromethane, leaching about 1% of Ru content in catalyst). A similar ammonium-tagged Hoveyda–Grubbs type catalyst

Olefin metathesis in air

• Lorenzo Piola,
• Fady Nahra and
• Steven P. Nolan

Beilstein J. Org. Chem. 2015, 11, 2038–2056, doi:10.3762/bjoc.11.221

• supported Hoveyda-type catalyst. Reaction conditions: 24 (5 mol %), nondegassed DCM, rt, 3 h, in air. Conversions determined by 1H NMR. E = COOEt. Synthesis of chiral Hoveyda–Grubbs type catalyst and its use in RO/CM. RCM reactions in air using 41 as catalyst. Reaction conditions: 41 (5 mol %), MeOH (0.05 M

Hoveyda–Grubbs type metathesis catalyst immobilized on mesoporous molecular sieves MCM-41 and SBA-15

• Hynek Balcar,
• Tushar Shinde,
• Naděžda Žilková and
• Zdeněk Bastl

Beilstein J. Org. Chem. 2011, 7, 22–28, doi:10.3762/bjoc.7.4

• Hynek Balcar Tushar Shinde Nadezda Zilkova Zdenek Bastl J. Heyrovský Institute of Physical Chemistry of AS CR, v.v.i, Dolejškova 3, 182 23 Prague 8, Czech Republic 10.3762/bjoc.7.4 Abstract A commercially available Hoveyda–Grubbs type catalyst (RC303 Zhannan Pharma) was immobilized on mesoporous

• unclear. The aims of this paper are the following: to report the immobilization of the Hoveyda–Grubbs type catalyst 3 (Figure 2, Zhan catalyst-1B) on mesoporous molecular sieves SBA-15 and MCM-41 as supports with this simple immobilization method; to describe the activity and stability of heterogeneous

• their bonding to the surface in greater detail. Conclusion The Hoveyda–Grubbs type catalyst 3 was immobilized on mesoporous molecular sieves MCM-41 and SBA-15 by mixing a suspension of 3 and sieves in toluene at room temperature. The immobilization proceeded quickly and almost quantitatively