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Updated: Jun 19, 2026

A Simple and Efficient Protocol for the Catalytic Insertion Polymerization of Functional Norbornenes
Published on: February 27, 2017
Gamma-agostic interactions stabilize the propagating species in the vinyl addition polymerization of norbornene
Marc D Walter1, Peter S White, Maurice Brookhart
1Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290, USA.
Abstract:
Cationic [(tmeda)Pd(OEt(2))(Me)][B(Ar(F))(4)] was synthesized by protonation of (tmeda)PdMe(2) and allowed for the first time the nature of the propagating species in the vinyl addition polymerization of norbornene to be discerned. In this system gamma-agostic interactions stabilize the propagating species and permit stepwise monomer insertions to be observed by (1)H NMR spectroscopy. This and earlier studies provide a new proposal for the propagating species in ligand-less late transition metal-catalyzed norbornene polymerizations.
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