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Asymmetric epoxidat...
Asymmetric epoxidation of styrene and chromenes catalysed by dimeric chiral (pyrrolidine salen)Mn(III) complexes
- Article/chapterEnglish2006
Publisher, publication year, extent ...
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Elsevier BV,2006
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:kth-16203
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-16203URI
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https://doi.org/10.1016/j.apcata.2006.09.011DOI
Supplementary language notes
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Language:English
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Summary in:English
Part of subdatabase
Classification
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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QC 20100525
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Two dimeric chiral (pyrrolidine salen)Mn(III) complexes 3 and 4 were prepared, in which the two (pyrrolidine salen)Mn(III) units are linked either by a p-xylylene or by ap-phthalyl bridge. High yields were attained for asymmetric epoxidation of styrene and substituted chromenes at 0.5-4.0 mol% catalyst loading of 3 and 4 using NaClO/PPNO and m-CPBA/NMO as oxidant systems, with 37-39% ee for styrene and 86-95% ee for substituted chromenes. Dimeric complexes 3 and 4 displayed higher activities than their parent monomeric complexes 1 and 2 of double equiv for epoxidation of substituted chromenes. Complex 3 bearing two tertiary amine units displayed considerably higher activity than analogous dimeric complex 4 containing two carboxamide units in the aforementioned reaction. The effect of excess CH3I on the epoxidation of 6-nitro-2,2-dimethylchromene catalysed by 3 in the aqueous/organic biphasic medium was explored. The recovery and recycling possibilities of the dimeric complexes 3 and 4 were studied.
Subject headings and genre
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asymmetric epoxidation
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chromene
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dimeric manganese complex
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salen ligand
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styrene
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highly enantioselective epoxidation
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phase-transfer capability
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nonfunctionalized alkenes
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unfunctionalised olefins
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salen complexes
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epoxides
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oxidant
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silica
Added entries (persons, corporate bodies, meetings, titles ...)
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Wang, Mei
(author)
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Zhang, Rong
(author)
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Wang, Xiuna
(author)
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Gao, Aiping
(author)
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Ma, Jia
(author)
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Sun, LichengKTH,Organisk kemi(Swepub:kth)u1umfd9h
(author)
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KTHOrganisk kemi
(creator_code:org_t)
Related titles
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In:Applied Catalysis A: Elsevier BV315, s. 120-1270926-860X1873-3875
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