Journal
CATALYSIS LETTERS
Volume 74, Issue 1-2, Pages 77-80Publisher
SPRINGER
DOI: 10.1023/A:1016682606382
Keywords
MCM-22; Jacobsen's catalyst; oxidation catalysis; ship-in-a-bottle complex
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A novel method for the encapsulation of homogeneous catalysts within the supercages (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 synthesis. This ship-in-a-bottle complex exhibited both higher activity and enantioselectivity for the epoxidation of a-methylstyrene compared with the homogeneous catalyst.
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