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- W4285494021 abstract "Cobalt-mediated radical polymerization (CMRP) is a versatile technique for controlling the polymerization of vinyl monomers via reversible termination using CoII complexes as persistent radical deactivators. Here, we report a facile approach for the in situ generation of Co–H as a discrete initiator and mediator for CMRP of acrylate and acrylamide monomers, overcoming the limitations of existing initiation strategies. In situ oxidation of a CoII complex followed by transmetalation with silane generates a Co-H species, which initiates polymerization via hydrometalation of the monomer. This method precludes an induction period with excellent control over targeted molecular weight and dispersity. Strikingly, our approach allows complete polymerization when the induction period ends for conventional CMRP. A broad scope of monomers is amenable to this protocol, including acrylates and acrylamides. Tunable catalyst electronics afford tailored dispersity while maintaining agreement in molecular weight in stark contrast to conventional methods. Elimination of this induction period imbues polymerization behavior entirely to the catalyst electronic effects on reversible deactivation/activation rates." @default.
- W4285494021 created "2022-07-15" @default.
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- W4285494021 date "2022-07-14" @default.
- W4285494021 modified "2023-09-30" @default.
- W4285494021 title "A Hydrometalation Initiation Mechanism via a Discrete Cobalt-Hydride for a Rapid and Controlled Radical Polymerization" @default.
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- W4285494021 doi "https://doi.org/10.1021/jacs.2c04655" @default.
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