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Titolo:
Heterogeneous aziridination of alkenes using Cu2+ exchanged zeolites
Autore:
Langham, C; Bethell, D; Lee, DE; McMorn, P; Page, PCB; Willock, DJ; Sly, C; Hancock, FE; King, F; Hutchings, GJ;
Indirizzi:
Univ Wales Coll Cardiff, Dept Chem, Cardiff CF1 3TB, S Glam, Wales Univ Wales Coll Cardiff Cardiff S Glam Wales CF1 3TB 1 3TB, S Glam, Wales Univ3BX,erpool, Dept Chem, Leverhulme Ctr Innovat Catalysis, Liverpool L69Univ Liverpool Liverpool Merseyside England L69 3BX alysis, Liverpool L69 Loughborough Univ Technol, Dept Chem, Loughborough LE11 3TU, Leics, England Loughborough Univ Technol Loughborough Leics England LE11 3TU cs, England ICI Katalco, R&T Div, Billingham TS23 1LB, Cleveland, England ICI KatalcoBillingham Cleveland England TS23 1LB 1LB, Cleveland, England Robbinson Bro Ltd, W Bromwich B70 0AH, W Midlands, England Robbinson Bro Ltd W Bromwich W Midlands England B70 0AH Midlands, England
Titolo Testata:
APPLIED CATALYSIS A-GENERAL
fascicolo: 1, volume: 182, anno: 1999,
pagine: 85 - 89
SICI:
0926-860X(19990607)182:1<85:HAOAUC>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
CATALYTIC ASYMMETRIC EPOXIDATION; TITANIUM SILICALITE TS-1; ALLYL ALCOHOL; HYDROGENATION; OLEFINS;
Keywords:
aziridination; alkenes; zeolites;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Hutchings, GJ Univ Wales Coll Cardiff, Dept Chem, POB 912, Cardiff CF1 3TB, S Glam, Wales Univ Wales Coll Cardiff POB 912 Cardiff S Glam Wales CF1 3TB
Citazione:
C. Langham et al., "Heterogeneous aziridination of alkenes using Cu2+ exchanged zeolites", APP CATAL A, 182(1), 1999, pp. 85-89

Abstract

Copper-exchanged zeolite Y (CuHY) is found to be a highly effective heterogeneous catalyst for the aziridination of alkenes using (N-(p-tolylsulfonyl)imino)phenyliodinane (PhI=NTs) as the nitrogen source:[GRAPHICS]Exchange of zeolite Y with other cations (Ag+, Co2+, Fe3+, Mg2+, Ni2+, Zn2) was found to be ineffective and the yield of the aziridine was lower than that obtained if no catalyst was present. This is considered to be due tothe ability of these metals to catalyze the breakdown of the PhI=NTs reagent into iodobenzene and toluene sulfonamide. Modification of the CuHY catalyst with bis(oxazolines) leads to the preparation of the first heterogeneous enantioselective aziridination catalyst and the results showing the effect of temperature and modifier concentration are described and discussed. The optimum reaction conditions for the aziridination of styrene are found tobe using acetonitrile solvent at -10 degrees C with a Cu2+: bis(oxazoline)ratio of 2:1, and under these conditions, e.e. of 34-35% have been observed. The catalyst can be recovered and reused without significant loss of catalyst performance. (C) 1999 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 23:32:45