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Asymmetric epoxidat...
Asymmetric epoxidation of styrene and chromenes catalysed by chiral (salen)Mn(III) complexes with a pyrrolidine backbone
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Wang, D. P. (författare)
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Wang, M. (författare)
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Wang, X. N. (författare)
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Chen, Y. G. (författare)
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Gao, A. P. (författare)
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Sun, Licheng C. (författare)
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- Elsevier BV, 2006
- 2006
- Engelska.
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Ingår i: Journal of Catalysis. - : Elsevier BV. - 0021-9517 .- 1090-2694. ; 237:2, s. 248-254
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- A series of chiral (pyrrolidine salen)Mn(III) complexes were synthesized front N-aza-substituted (R,R)-N,N'-bis(3,5-di-tert-butylsalicylidene)-3.4-diaminopyrrolidine salen ligands. High yields and comparable enantioselectivity relative to Jacobsen's catalyst were achieved in asymmetric epoxidation of styrene and chromenes using NaClO/PPNO and m-CPBA/NMO as the oxidant systems. Complexes 1-3, featuring a tertiary airline unit, displayed higher activity than complex 4, bearing ail amide unit and Jacobsen's catalyst in the NaClO/PPNO aqueous/organic biphasic system. The influence of CH3I on epoxidation of 6-nitro-2,2-dimethylchromene catalysed by 1-4 in the biphasic medium was Studied to explore the catalysts with built-in phase-transfer capability. The alkenes' access pathway is discussed on the basis of the steric effect of the N-aza-substituent in the pyrrolidine backbone of complexes 1-3 on the enantioselectivity of epoxidation.
Nyckelord
- asymmetric epoxidation
- enantioselectivity
- pyrrolidine
- (salen)Mn(III) complex
- unfunctionalized alkenes
- active (salen)manganese(iii) complexes
- phase-transfer capability
- enantioselective epoxidation
- nonfunctionalized alkenes
- salen complexes
- olefins
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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