Enantioselective epoxidations catalyzed by zeolite MCM-22 encapsulated Jacobsen's catalyst

Authors
Gbery, G Zsigmond, A Balkus, KJ
Citation
G. Gbery et al., Enantioselective epoxidations catalyzed by zeolite MCM-22 encapsulated Jacobsen's catalyst, CATAL LETT, 74(1-2), 2001, pp. 77-80
Citations number
18
Categorie Soggetti
Physical Chemistry/Chemical Physics","Chemical Engineering
Journal title
CATALYSIS LETTERS
ISSN journal
1011372X → ACNP
Volume
74
Issue
1-2
Year of publication
2001
Pages
77 - 80
Database
ISI
SICI code
1011-372X(2001)74:1-2<77:EECBZM>2.0.ZU;2-0
Abstract
A novel method for the encapsulation of homogeneous catalysts within the su percages (7.1 x 18.2 Angstrom) of zeolite MCM-22 has been developed. By way of example, the well known asymmetric oxidation catalyst (R,R)-N,N-bis(3,5 -di-tert-butylsalicylidedene)-1,2-cyclohexanediaminemanganese(III) chloride , a.k.a Jacobsen's catalyst, was occluded in MCM-22 during the zeolite synt hesis. This ship-in-a-bottle complex exhibited both higher activity and ena ntioselectivity for the epoxidation of a-methylstyrene compared with the ho mogeneous catalyst.