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- W3036801613 abstract "Abstract This manuscript describes a kind of bifunctional organocatalyst with unprecedented reactivity for the synthesis of polyethers via ring‐opening polymerization (ROP) of epoxides under mild conditions. The bifunctional catalyst incorporates two 9‐borabicyclo[3.3.1]nonane centers on the two ends as Lewis acidic sites for epoxide activation and a quaternary ammonium halide in the middle as the initiating site. The catalyst could be easily prepared in two steps from commercially available stocks on up to kilogram scale with ≈100 % yield. The organoboron catalyst mediated ROP of epoxides displays living behavior with low catalyst loading (5 ppm) and enables the synthesis of polyethers with molecular weights of over a million grams per mole (>10 6 g mol −1 ). Based on the investigations on crystal structure of catalyst, MALDI‐TOF, and 11 B NMR spectroscopy, an intramolecular ammonium cation assisted S N 2 mechanism is proposed and verified by DFT calculations." @default.
- W3036801613 created "2020-06-25" @default.
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- W3036801613 date "2020-07-27" @default.
- W3036801613 modified "2023-10-16" @default.
- W3036801613 title "High‐Activity Organocatalysts for Polyether Synthesis via Intramolecular Ammonium Cation Assisted S <sub>N</sub> 2 Ring‐Opening Polymerization" @default.
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- W3036801613 doi "https://doi.org/10.1002/anie.202002815" @default.
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