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Titolo:
Asymmetric dihydroxylation using heterogenized cinchona alkaloid ligands on mesoporous silica
Autore:
Lee, HM; Kim, SW; Hyeon, T; Kim, BM;
Indirizzi:
Seoul Natl Univ, Sch Chem & Mol Engn, Ctr Mol Catalysis, Seoul 151742, South Korea Seoul Natl Univ Seoul South Korea 151742 ysis, Seoul 151742, South Korea Seoul Natl Univ, Sch Chem Engn, Seoul 151742, South Korea Seoul Natl UnivSeoul South Korea 151742 Engn, Seoul 151742, South Korea Seoul Natl Univ, Inst Chem Proc, Seoul 151742, South Korea Seoul Natl Univ Seoul South Korea 151742 Proc, Seoul 151742, South Korea
Titolo Testata:
TETRAHEDRON-ASYMMETRY
fascicolo: 11, volume: 12, anno: 2001,
pagine: 1537 - 1541
SICI:
0957-4166(20010704)12:11<1537:ADUHCA>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
CATALYTIC DIHYDROXYLATION; POLYMER SUPPORT; OLEFINS; ALKENES; BENZALDEHYDE; EPOXIDATION; EFFICIENT; MCM-41; SCOPE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Kim, BM Seoul Natl Univ, Sch Chem & Mol Engn, Ctr Mol Catalysis, Seoul 151742, South Korea Seoul Natl Univ Seoul South Korea 151742 oul 151742, South Korea
Citazione:
H.M. Lee et al., "Asymmetric dihydroxylation using heterogenized cinchona alkaloid ligands on mesoporous silica", TETRAHEDR-A, 12(11), 2001, pp. 1537-1541

Abstract

Cinchona alkaloids have been successfully grafted on mesoporous silica. Asymmetric dihydroxylation using the heterogenized chiral ligands procceded with varying degrees of enantioselection depending upon the nature of the chiral ligands. High asymmetric induction (up to > 99.5% enantiomeric excess)almost equal to that obtained from the homogeneous, catalyst system could be achieved using a dimeric alkaloid ligand with a six-carbon link between the ligand and the Support (L3). while inferior results were obtained when a monomeric alkaloid ligand system vas used. Reduced enantioselectivites were observed upon repeated recycling of the immobilized ligand system. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 06:47:56