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Updated: Apr 23, 2026

A Simple and Efficient Protocol for the Catalytic Insertion Polymerization of Functional Norbornenes
Published on: February 27, 2017
Polymerization of norbornene using chiral bis(phenolate) zirconium catalysts
Marie Tschage1, Seungwhan Jung, Thomas P Spaniol
1RWTH Aachen University, Institute of Inorganic Chemistry, Landoltweg 1, 52056, Aachen, Germany.
Zirconium catalysts with bis(phenolate) ligands enable the polymerization of norbornene, yielding high molecular weight polymers. Enantiopure catalysts demonstrate optical induction, with microstructure analysis aided by copolymers and hydrooligomers.
Area of Science:
- Polymer Chemistry
- Organometallic Chemistry
- Catalysis
Background:
- Norbornene polymerization is crucial for advanced materials.
- Developing stereoselective catalysts is key for controlling polymer properties.
- Solubility challenges hinder detailed analysis of poly(norbornene) microstructure.
Purpose of the Study:
- To investigate norbornene polymerization using zirconium catalysts with (OSSO)-type bis(phenolate) ligands.
- To explore optical induction in poly(norbornene) using enantiopure precatalysts.
- To characterize the microstructure of insoluble poly(norbornene)s.
Main Methods:
- Polymerization of norbornene using zirconium-bis(phenolate) precatalysts (racemic and enantiopure).
- Synthesis of norbornene-ethylene copolymers and hydrooligomers to aid characterization.
- Analysis of polymer microstructure and optical activity.
Main Results:
- High molecular weight poly(norbornene) was produced using a racemic precatalyst, exhibiting slight optical activity.
- Enantiopure catalysts ((S,S)-1 and (R,R)-1) induced optical activity in the resulting polymers.
- Copolymerization with ethylene and formation of hydrooligomers facilitated microstructure studies of otherwise insoluble polymers.
- The crystal structure of a norbornene tetramer was determined.
Conclusions:
- Zirconium-bis(phenolate) catalysts are effective for norbornene polymerization.
- Stereoselective polymerization and optical induction are achievable.
- Advanced analytical techniques, including copolymerization, are vital for studying insoluble polymers.
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