A Ring‐Opening Metathesis Polymerization Catalyst That Exhibits Redox‐Switchable Monomer Selectivities. Issue 25 (3rd February 2017)

• Record Type: Journal Article
• Authors: Lastovickova, Dominika N.; Shao, Huiling; Lu, Gang; Liu, Peng; Bielawski, Christopher W.
• Is Part Of: Chemistry. Volume 23:Issue 25(2017)
• Page Start: 5994
• Page End: 6000
• Publication Date: 2017-02-03
• Subjects: N-heterocyclic carbene -- olefin metathesis -- polymerization -- redox -- switchable; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201605738
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: A ring‐opening metathesis polymerization catalyst supported by a redox‐active N ‐heterocyclic carbene was synthesized and found to undergo reversible reduction. In its neutral form, the catalyst polymerized 1, 5‐ cis, cis ‐cyclooctadiene at a higher rate than that of a norbornene derivative; however, upon reduction, the selectivity was found to reverse. Utilizing this oxidation state dependent selectivity, a series of copolymers with controlled compositions, microstructures, and physical properties were prepared by redox‐switching the catalyst over the course of a series of polymerization reactions. Abstract : I choose you ! A redox‐switchable analogue of the Grubbs third‐generation catalyst was shown to selectively polymerize certain monomers within various mixtures depending on the oxidation state of the redox‐active ligand.