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- W4281792224 abstract "Abstract The oxyanionic ring‐opening polymerization of propylene oxide (PO) from an exogenous alcohol activated with benign (complexed) metal‐alkali carboxylates is described. The equimolar mixture of potassium acetate (KOAc) and 18‐crown‐6 ether (18C6) is demonstrated to be the complex of choice for preparing poly(propylene oxide) (PPO) in a controlled manner. In the presence of 18C6/KOAc, hydrogen‐bonded alcohols act as soft nucleophiles promoting the PO S N 2 process at room temperature and in solvent‐free conditions while drastically limiting the occurrence of parasitic hydrogen abstraction generally observed during the anionic ROP of PO. The resulting PPO displays predictable and unprecedented molar masses (up to 20 kg mol −1 ) with low dispersities ( Đ M < 1.1), rendering the 18C6/KOAc complex the most performing activator for the oxyanionic polymerization of PO reported to date. Preliminary studies on the preparation of block and statistical copolyethers are also reported." @default.
- W4281792224 created "2022-06-13" @default.
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- W4281792224 date "2022-06-16" @default.
- W4281792224 modified "2023-09-26" @default.
- W4281792224 title "Controlled Oxyanionic Polymerization of Propylene Oxide: Unlocking the Molecular‐Weight Limitation by a Soft Nucleophilic Catalysis" @default.
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- W4281792224 doi "https://doi.org/10.1002/marc.202200424" @default.
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