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Titolo:
New soluble bifunctional polymeric chiral ligands for enantioselectively catalytic reactions
Autore:
Fan, QH; Liu, GH; Deng, GJ; Chen, XM; Chan, ASC;
Indirizzi:
Chinese Acad Sci, Inst Chem, LMRSS, Ctr Mol Sci, Beijing 100080, Peoples RChina Chinese Acad Sci Beijing Peoples R China 100080 g 100080, Peoples RChina Hong Kong Polytech Univ, Open Lab Chirotechnol, Hong Kong, Hong Kong, Peoples R China Hong Kong Polytech Univ Hong Kong Hong Kong Peoples R China ples R China Hong Kong Polytech Univ, Dept Appl Biol & Chem Technol, Hong Kong, Hong Kong, Peoples R China Hong Kong Polytech Univ Hong Kong Hong Kong Peoples R China ples R China
Titolo Testata:
TETRAHEDRON LETTERS
fascicolo: 51, volume: 42, anno: 2001,
pagine: 9047 - 9050
SICI:
0040-4039(200112)42:51<9047:NSBPCL>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
ASYMMETRIC CATALYSIS; ALDEHYDES; BINAP; CYANOSILYLATION; HYDROGENATION; COMPLEX; KETONES; DIHYDROXYLATION; EPOXIDATION; DIETHYLZINC;
Keywords:
bifunctional catalyst; soluble polymeric ligand; asymmetric catalysis; BINAP; BINOL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Physical, Chemical & Earth Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Fan, QH Chinese Acad Sci, Inst Chem, LMRSS, Ctr Mol Sci, Beijing 100080, Peoples RChina Chinese Acad Sci Beijing Peoples R China 100080 , Peoples RChina
Citazione:
Q.H. Fan et al., "New soluble bifunctional polymeric chiral ligands for enantioselectively catalytic reactions", TETRAHEDR L, 42(51), 2001, pp. 9047-9050

Abstract

Two new soluble bifunctional polymeric ligands (R,R)-4 and (R,R)-5 have been prepared via the direct condensation reaction of (R)-3.3'-diformyl-1.1'-bi-2-naphthol (R)-1 with (R)-5.5'-diamino BINAP (R)-2 and with (R)-5.5'-diamino BINAPO (R)-3, respectively. The different types of catalytic centers, BINOL and BINAP or BINAPO, were alternatively organized in a regular chiralpolymer chain. Both polymeric ligands were found to be effective in the addition of diethylzinc to benzaldehyde either in the presence or in the absence of Ti(OPr')(4) with different enantioselectivities. (R.R)-4,Ti(IV) catalyst. which showed similar efficiency to the parent catalyst BINOL,Ti(IV). was more enantioselective than (R.R)-5,Ti(IV), (R,R)-4 was also found to behighly effective in the RU(II)-catalyzed asymmetric hydrogenation of 2-arylacrylic acids. The results demonstrated that the use of the co-polymer catalyst rather than a Mixture of monomer catalysts not only simplified the recycling of the catalyst, but also improved the enantioselectivity and/or the activity in some cases. (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 26/11/20 alle ore 14:30:42