Issue 5, 2017

Redox control in palladium catalyzed norbornene and alkyne polymerization

Abstract

Two palladium complexes (NHC)Pd(allyl)Cl (NHC = 1,3-Ar2-naphthoquinimidazolylidene, Ar = 2,6-Me2-C6H3, 2,6-iPr2-C6H3) 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.

Graphical abstract: Redox control in palladium catalyzed norbornene and alkyne polymerization

Supplementary files

Article information

Article type
Research Article
Submitted
07 dec 2016
Accepted
08 feb 2017
First published
09 feb 2017

Inorg. Chem. Front., 2017,4, 795-800

Redox control in palladium catalyzed norbornene and alkyne polymerization

W. Zou, W. Pang and C. Chen, Inorg. Chem. Front., 2017, 4, 795 DOI: 10.1039/C6QI00562D

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