期刊
BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY
卷 11, 期 -, 页码 2087-2096出版社
BEILSTEIN-INSTITUT
DOI: 10.3762/bjoc.11.225
关键词
Hoveyda-Grubbs type catalyst; hybrid catalysts; lamellar zeolites; non-covalent immobilization; olefin metathesis
资金
- Grant Agency of the Czech Republic [P106/12/0189]
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 approximate to 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.
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