Controlled and efficient polymerization of conjugated polar alkenes by lewis pairs based on sterically hindered aryloxide-substituted alkylaluminumitle

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Abstract

Reported herein is the development of an effective strategy for controlled and efficient Lewis pair polymerization of conjugated polar alkenes, including methyl methacrylate (MMA), n-butyl methacrylate (nBuMA), and γ-methyl-α-methylene-γ-butyrolactone (γMMBL), by the utilization of sterically encumbered Al(BHT)2Me (BHT: 2,6-di-tert-butyl-4-methylphenol) as a Lewis acid that shuts down intramolecular backbiting termination. In combination with a selected N-heterocyclic carbene (NHC) as a Lewis base, the polymerization of MMA exhibited activity up to 3000 h−1 TOF and an acceptable initiation efficiency of 60.6%, producing polymers with high molecular weight (Mn up to 130 kg/mol) and extremely narrow dispersity (Đ = 1.06~1.13). This controlled polymerization with a living characteristic has been evidenced by chain-extension experiments and chain-end analysis, and enabled the synthesis of well-defined diblock copolymers.

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Wang, X., Zhang, Y., & Hong, M. (2018). Controlled and efficient polymerization of conjugated polar alkenes by lewis pairs based on sterically hindered aryloxide-substituted alkylaluminumitle. Molecules, 23(2). https://doi.org/10.3390/molecules23020442

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