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- W2945492040 abstract "Abstract A dual catalytic setup based on N‐heterocyclic olefins (NHOs) and magnesium bis(hexamethyldisilazide) (Mg(HMDS) 2 ) was used to prepare poly(propylene oxide) with a molar mass ( M n ) >500 000 g mol −1 , in some cases even >10 6 g mol −1 , as determined by GPC/light scattering. This is achieved by combining the rapid polymerization characteristics of a zwitterionic, Lewis pair type mechanism with the efficient epoxide activation by the Mg II species. Transfer‐to‐monomer, traditionally frustrating attempts at synthesizing polyethers with a high degree of polymerization, is practically removed as a limiting factor by this approach. NMR and MALDI‐ToF MS experiments reveal key aspects of the proposed mechanism, whereby the polymerization is initiated via nucleophilic attack by the NHO on the activated monomer, generating a zwitterionic species. This strategy can also be extended to other epoxides, including functionalized monomers." @default.
- W2945492040 created "2019-05-29" @default.
- W2945492040 creator A5005162883 @default.
- W2945492040 creator A5015010091 @default.
- W2945492040 creator A5089460963 @default.
- W2945492040 date "2019-06-27" @default.
- W2945492040 modified "2023-10-16" @default.
- W2945492040 title "Lewis Pair Polymerization of Epoxides via Zwitterionic Species as a Route to High‐Molar‐Mass Polyethers" @default.
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- W2945492040 doi "https://doi.org/10.1002/anie.201904806" @default.
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