Journal
CHEMCATCHEM
Volume 7, Issue 20, Pages 3234-3238Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201500842
Keywords
asymmetric catalysis; heterogeneous catalysis; iodolactonization; polymers; zinc
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Funding
- Tokuyama Science Foundation
- Ministry of Education, Culture, Sports, Science and Technology (Japan)
- Grants-in-Aid for Scientific Research [15K05583, 26105706] Funding Source: KAKEN
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On the basis of the structure of the unimolecular Zn-3(OAc)(4)-3,3-bis(aminoimino)binaphthoxide complex, a poly-Zn-3(OAc)(4)-3,3-bis(aminoimino)binaphthoxide (poly-Zn) complex was prepared from 3,3-diformylbinaphthol, tetramine, and Zn(OAc)(2). The first-generation poly-Zn catalyst (poly-Zn1) was prepared from poly(aminoiminobinaphthol) and Zn(OAc)(2). Although poly-Zn1 showed high catalytic activity for iodolactonization, the catalyst could not be reused. The second-generation poly-Zn catalyst (poly-Zn2) was prepared by the self-organization of 3,3-diformylbinaphthol, tetramine, and Zn(OAc)(2). This produced a stable and active poly-Zn2 catalyst for asymmetric iodolactonization that was reused over five cycles.
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