Redox control in palladium catalyzed norbornene and alkyne polymerization. Issue 5 (22nd February 2017)

• Record Type: Journal Article
• Authors: Zou, Wenping; Pang, Wenmin; Chen, Changle
• Is Part Of: Inorganic chemistry frontiers. Volume 4:Issue 5(2017)
• Page Start: 795
• Page End: 800
• Publication Date: 2017-02-22
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c6qi00562d
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : Switchable polymerization of norbornene, 5-norbornene-2-yl acetate and 1-chloro-1-octyne could be realized by using two palladium complexes (NHC)Pd(allyl)Cl (NHC = 1, 3-Ar2 -naphthoquinimidazolylidene, Ar = 2, 6-Me2 -C6 H3, 2, 6- i Pr2 -C6 H3 ) bearing a redox-active naphthoquinone moiety. Abstract : Two palladium complexes (NHC)Pd(allyl)Cl (NHC = 1, 3-Ar2 -naphthoquinimidazolylidene, Ar = 2, 6-Me2 -C6 H3, 2, 6- i Pr2 -C6 H3 ) bearing a redox-active naphthoquinone moiety, were prepared and characterized. Electro-chemistry cyclic voltammetry and NMR studies showed that these palladium complexes could be easily reduced and re-oxidized using CoCp2 and [FeCp2 ][BAF] (BAF = tetrakis(3, 5-bis(trifluoromethyl)phenyl)borate) reagents. The properties of these neutral and reduced palladium complexes in norbornene, 5-norbornene-2-yl acetate and 1-chloro-1-octyne polymerization were studied. The neutral complexes were active in all of these polymerization reactions in the presence of Na[BAF]. In contrast, the reduced analogues showed very low activity under the same conditions. As such, switchable polymerization could be realized in this catalytic system.