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Titolo:
Catalytic heterogeneous aziridination of styrene using CuHY catalyst: an assessment of catalyst stability
Autore:
Taylor, S; Gullick, J; McMorn, P; Bethell, D; Page, PCB; Hancock, FE; King, F; Hutchings, GJ;
Indirizzi:
Cardiff Univ, Dept Chem, Cardiff CF10 3TB, S Glam, Wales Cardiff Univ Cardiff S Glam Wales CF10 3TB ardiff CF10 3TB, S Glam, Wales Univ Liverpool, Dept Chem, Leverhulme Ctr Innovat Catalysis, Liverpool L693BX, Merseyside, England Univ Liverpool Liverpool Merseyside England L69 3BX , Merseyside, England Loughborough Univ Technol, Dept Chem, Loughborough LE11 3TU, Leics, England Loughborough Univ Technol Loughborough Leics England LE11 3TU cs, England Synetix, Billingham TS23 1LB, Teesside, England Synetix Billingham Teesside England TS23 1LB TS23 1LB, Teesside, England
Titolo Testata:
JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2
fascicolo: 9, , anno: 2001,
pagine: 1724 - 1728
SICI:
1472-779X(200109):9<1724:CHAOSU>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
COMPLEXES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Hutchings, GJ Cardiff Univ, Dept Chem, POB 912, Cardiff CF10 3TB, S Glam, Wales Cardiff Univ POB 912 Cardiff S Glam Wales CF10 3TB am, Wales
Citazione:
S. Taylor et al., "Catalytic heterogeneous aziridination of styrene using CuHY catalyst: an assessment of catalyst stability", J CHEM S P2, (9), 2001, pp. 1724-1728

Abstract

The stability of the heterogeneous CuHY catalyst for the aziridination of styrene using nitrene donors, with and without the presence of chiral bis(oxazoline) modifiers, is described in detail. Cu2+ is found to leach from the CuHY and the rate of Cu-leaching is dependent on the reaction time, the nature of the nitrene donor, the structure of the bis(oxazoline), the presence of solvent and the breakdown products of the nitrene donor. It is found that between 0.08-6.8% by weight of the Cu present in CuHY can be leached during standard reaction conditions. However, using short reaction times it is shown that the amount of Cu removed can be limited readily to the lower value. Detailed studies show that for this reaction system the leached Cu2plays no significant role in the formation of the aziridine, and that the high enantioselectivities observed with CuHY are due to Cu2+ which is electrostatically bound within the pores of the zeolite and modified by a chiralbis(oxazoline) ligand.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 20:29:44