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Statements

Subject Item
n2:RIV%2F61388955%3A_____%2F14%3A00431081%21RIV15-GA0-61388955
rdf:type
n4:Vysledek skos:Concept
dcterms:description
Ruthenium olefin metathesis catalysts bearing a polar quaternary ammonium group in N-heterocyclic ligand were immobilized on silica and siliceous mesoporous molecular sieves with different pore sizes (SBA-15 and MCM-41). The activity of the heterogeneous catalysts was found to increase with an increase in pore size of the support used, with the best results observed for SBA-15-supported catalyst. The influence of reaction conditions (temperature, solvent, catalyst, and substrate concentration) on the efficiency of new heterogeneous catalysts was established. A significant influence of the counterion present in the ruthenium complex on the activity of immobilized catalysts was also found: those derived from chloride containing ion exhibited the highest activity. High activity in ring-closing metathesis of substrates as citronellene, 1,7-octadiene, and diallyl compounds as well as in cross-metathesis of unsaturated aliphatic compounds with methyl acrylate was observed under optimized conditions. In some cases, heterogenization led to catalysts with efficiency higher than those observed for corresponding homogeneous complexes. Ruthenium olefin metathesis catalysts bearing a polar quaternary ammonium group in N-heterocyclic ligand were immobilized on silica and siliceous mesoporous molecular sieves with different pore sizes (SBA-15 and MCM-41). The activity of the heterogeneous catalysts was found to increase with an increase in pore size of the support used, with the best results observed for SBA-15-supported catalyst. The influence of reaction conditions (temperature, solvent, catalyst, and substrate concentration) on the efficiency of new heterogeneous catalysts was established. A significant influence of the counterion present in the ruthenium complex on the activity of immobilized catalysts was also found: those derived from chloride containing ion exhibited the highest activity. High activity in ring-closing metathesis of substrates as citronellene, 1,7-octadiene, and diallyl compounds as well as in cross-metathesis of unsaturated aliphatic compounds with methyl acrylate was observed under optimized conditions. In some cases, heterogenization led to catalysts with efficiency higher than those observed for corresponding homogeneous complexes.
dcterms:title
Ru-Based Complexes with Quaternary Ammonium Tags Immobilized on Mesoporous Silica as Olefin Metathesis Catalysts Ru-Based Complexes with Quaternary Ammonium Tags Immobilized on Mesoporous Silica as Olefin Metathesis Catalysts
skos:prefLabel
Ru-Based Complexes with Quaternary Ammonium Tags Immobilized on Mesoporous Silica as Olefin Metathesis Catalysts Ru-Based Complexes with Quaternary Ammonium Tags Immobilized on Mesoporous Silica as Olefin Metathesis Catalysts
skos:notation
RIV/61388955:_____/14:00431081!RIV15-GA0-61388955
n6:aktivita
n18:P n18:I
n6:aktivity
I, P(GAP106/12/0189)
n6:cisloPeriodika
9
n6:dodaniDat
n16:2015
n6:domaciTvurceVysledku
n7:7016662 n7:7579543 n7:2992701 n7:4766350 n7:6503284
n6:druhVysledku
n17:J
n6:duvernostUdaju
n15:S
n6:entitaPredkladatele
n13:predkladatel
n6:idSjednocenehoVysledku
43540
n6:idVysledku
RIV/61388955:_____/14:00431081
n6:jazykVysledku
n10:eng
n6:klicovaSlova
olefin metathesis; heterogeneous catalysts; mesoporous molecular sieves
n6:klicoveSlovo
n11:mesoporous%20molecular%20sieves n11:heterogeneous%20catalysts n11:olefin%20metathesis
n6:kodStatuVydavatele
US - Spojené státy americké
n6:kontrolniKodProRIV
[27882382862F]
n6:nazevZdroje
ACS Catalysis
n6:obor
n12:CF
n6:pocetDomacichTvurcuVysledku
5
n6:pocetTvurcuVysledku
7
n6:projekt
n14:GAP106%2F12%2F0189
n6:rokUplatneniVysledku
n16:2014
n6:svazekPeriodika
4
n6:tvurceVysledku
Čejka, Jiří Czarnocki, S. J. Pastva, Jakub Skowerski, K. Balcar, Hynek Bastl, Zdeněk Žilková, Naděžda
n6:wos
000341405600046
s:issn
2155-5435
s:numberOfPages
10
n8:doi
10.1021/cs500796u