Mesoporous Molecular Sieves as Advanced Supports for Olefin Metathesis Catalysts

2010 ◽  
Vol 293 (1) ◽  
pp. 43-47 ◽  
Author(s):  
Hynek Balcar ◽  
Jiří Čejka
Keyword(s):  
Molecular Sieves ◽  
Olefin Metathesis ◽  
Mesoporous Molecular Sieves ◽  
Metathesis Catalysts

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

2015 ◽  
Vol 11 ◽  
pp. 2087-2096 ◽  
Author(s):  
Hynek Balcar ◽  
Naděžda Žilková ◽  
Martin Kubů ◽  
Michal Mazur ◽  
Zdeněk Bastl ◽  
...  
Keyword(s):  
Methyl Oleate ◽  
Molecular Sieves ◽  
Olefin Metathesis ◽  
Mesoporous Molecular Sieves ◽  
Xps Analysis ◽  
Hybrid Catalyst ◽  
Counter Anion ◽  
Ring Closing Metathesis ◽  
Metathesis Reactions ◽  
Ru Complexes

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.

Activated Hoveyda‐Grubbs Olefin Metathesis Catalysts Derived from a Large Scale Produced Pharmaceutical Intermediate—Sildenafil Aldehyde

2021 ◽  
Author(s):  
Louis Monsigny ◽  
Jakub Piątkowski ◽  
Damian Trzybiński ◽  
Krzysztof Wozniak ◽  
Tomasz Nienałtowski ◽  
...  
Keyword(s):  
Olefin Metathesis ◽  
Large Scale ◽  
Metathesis Catalysts

Nitrenium ions and trivalent boron ligands as analogues of N-heterocyclic carbenes in olefin metathesis: a computational study

2015 ◽  
Vol 44 (46) ◽  
pp. 20021-20026 ◽  
Author(s):  
A. Pazio ◽  
K. Woźniak ◽  
K. Grela ◽  
B. Trzaskowski
Keyword(s):  
Olefin Metathesis ◽  
Computational Study ◽  
Heterocyclic Carbenes ◽  
Mechanistic Study ◽  
Nitrenium Ions ◽  
Nitrenium Ion ◽  
Metathesis Catalysts

A DFT mechanistic study reveals that nitrenium ion-modified Hoveyda-like complexes are good candidates for latent metathesis catalysts, while boron-modified systems are candidates for very fast metathesis catalysts.

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