Remote Perfluoroalkyl Substituents are Key to Living Aqueous Ethylene Polymerization

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Abstract: In various nickel (II) salicylaldiminato ethylene polymerization catalysts, which are a versatile mechanistic probe for substituent effects, longer perfluoroalkyl groups exert a strong effect on catalytic activities and polymer microstructures compared to the trifluoromethyl group. This effect is accounted for by a reduced electron density on the active sites, and is also supported by electrochemical studies. Thus, β‐hydride elimination, the key step of chain transfer and branching pathways, is disfavored while chain‐growth rates are enhanced. This enhancement occurs to an extent that enables living polymerizations in aqueous systems to afford ultra‐high‐molecular‐weight polyethylene for various chelating salicylaldimine motifs. These findings are mechanistically instructive as well as practically useful for illustrating the potential of perfluoroalkyl groups in catalyst design.

Location: Deutsche Nationalbibliothek Frankfurt am Main

Extent: Online-Ressource

Language: Englisch

Bibliographic citation: Remote Perfluoroalkyl Substituents are Key to Living Aqueous Ethylene Polymerization ; volume:59 ; number:8 ; year:2020 ; pages:3258-3263 ; extent:6
Angewandte Chemie / International edition. International edition ; 59, Heft 8 (2020), 3258-3263 (gesamt 6)

Creator: Schnitte, Manuel
Scholliers, Janine S.
Riedmiller, Kai
Mecking, Stefan

DOI: 10.1002/anie.201913117

URN: urn:nbn:de:101:1-2022062213055187771946

Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.

Last update: 15.08.2025, 7:30 AM CEST

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Associated

Schnitte, Manuel
Scholliers, Janine S.
Riedmiller, Kai
Mecking, Stefan

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