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- Title
Zwitterionic Design Principle of Nickel(II) Catalysts for Carbonylative Polymerization of Cyclic Ethers.
- Authors
Dai, Yiwei; He, Shiyu; Peng, Bangan; Jia, Li; Crandall, Laura A.; Schrage, Briana R.; Ziegler, Christopher J.
- Abstract
Zwitterionic structure is necessary for NiII complexes to catalyze carbonylative polymerization (COP) of cyclic ethers. The cationic charge at the NiII center imparts sufficient electrophilicity to the Ni–acyl bond for it to react with cyclic ethers to give an acyl‐cyclic ether oxonium intermediate, while the ligand‐centered anionic charge ensures that the resultant oxonium cation is ion‐paired with the Ni0 nucleophile. The current catalysts give non‐alternating copolymers of carbon monoxide and cyclic ethers and are the most effective when both ethylene oxide and tetrahydrofuran are present as the cyclic ether monomers.
- Subjects
POLYMERIZATION; NICKEL catalysts; CYCLIC ethers; ZWITTERIONS; COPOLYMERS
- Publication
Angewandte Chemie, 2018, Vol 130, Issue 43, p14307
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201808507