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Statements

Subject Item
n2:RIV%2F61388955%3A_____%2F11%3A00360231%21RIV12-GA0-61388955
rdf:type
n6:Vysledek skos:Concept
dcterms:description
Hybrid catalysts for olefin metathesis were prepared by the immobilization of Ru alkylidenes (Grubbs catalysts) on mesoporous molecular sieves SBA-15 and MCM-41 having the surface modified with molecules bearing dicyclohexylphosphine (PCy2) and pyridine end groups. Hybrid catalysts with Ru attached to the surface via PCy2 ligands exhibited higher activity and stability than those with Ru attached via pyridine ligands. The former catalysts exhibited a high activity in a series of metathesis reactions (RCM, ROMP, and cross-metathesis) reaching turnover numbers (TONs) from 200 to 2000 and being reusable several times. The filtration tests for all catalysts suggested that the solid catalysts were responsible for catalytic activity during the reactions. Only low Ru leaching was observed. A positive effect of the pore size of the support on catalyst activity was observed for the metathesis of methyl oleate. Hybrid catalysts for olefin metathesis were prepared by the immobilization of Ru alkylidenes (Grubbs catalysts) on mesoporous molecular sieves SBA-15 and MCM-41 having the surface modified with molecules bearing dicyclohexylphosphine (PCy2) and pyridine end groups. Hybrid catalysts with Ru attached to the surface via PCy2 ligands exhibited higher activity and stability than those with Ru attached via pyridine ligands. The former catalysts exhibited a high activity in a series of metathesis reactions (RCM, ROMP, and cross-metathesis) reaching turnover numbers (TONs) from 200 to 2000 and being reusable several times. The filtration tests for all catalysts suggested that the solid catalysts were responsible for catalytic activity during the reactions. Only low Ru leaching was observed. A positive effect of the pore size of the support on catalyst activity was observed for the metathesis of methyl oleate.
dcterms:title
Grubbs Catalysts Immobilized on Mesoporous Molecular Sieves via Phosphine and Pyridine Linkers Grubbs Catalysts Immobilized on Mesoporous Molecular Sieves via Phosphine and Pyridine Linkers
skos:prefLabel
Grubbs Catalysts Immobilized on Mesoporous Molecular Sieves via Phosphine and Pyridine Linkers Grubbs Catalysts Immobilized on Mesoporous Molecular Sieves via Phosphine and Pyridine Linkers
skos:notation
RIV/61388955:_____/11:00360231!RIV12-GA0-61388955
n6:predkladatel
n14:ico%3A61388955
n3:aktivita
n11:Z n11:P
n3:aktivity
P(GD203/08/H032), P(IAA400400805), P(KAN100400701), Z(AV0Z40400503)
n3:cisloPeriodika
7
n3:dodaniDat
n10:2012
n3:domaciTvurceVysledku
n7:6327230 n7:4766350 n7:5283396 n7:7016662 n7:5153387 n7:6503284
n3:druhVysledku
n20:J
n3:duvernostUdaju
n4:S
n3:entitaPredkladatele
n17:predkladatel
n3:idSjednocenehoVysledku
201593
n3:idVysledku
RIV/61388955:_____/11:00360231
n3:jazykVysledku
n13:eng
n3:klicovaSlova
Grubbs catalyst; mesoporous molecular sieves; olefin metathesis
n3:klicoveSlovo
n5:Grubbs%20catalyst n5:mesoporous%20molecular%20sieves n5:olefin%20metathesis
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[354482AD96FB]
n3:nazevZdroje
ACS Catalysis
n3:obor
n16:CF
n3:pocetDomacichTvurcuVysledku
6
n3:pocetTvurcuVysledku
6
n3:projekt
n12:IAA400400805 n12:KAN100400701 n12:GD203%2F08%2FH032
n3:rokUplatneniVysledku
n10:2011
n3:svazekPeriodika
1
n3:tvurceVysledku
Horáček, Michal Žilková, Naděžda Bek, David Čejka, Jiří Zukal, Arnošt Balcar, Hynek
n3:wos
000292479400006
n3:zamer
n19:AV0Z40400503
s:issn
2155-5435
s:numberOfPages
10
n18:doi
10.1021/cs200090e