What does this research mean for the field?

The catalytic activity and cis selectivity of NHC-supported (arylimido)niobium(V)–alkylidene catalysts in the ring-opening metathesis polymerization of norbornene and tetracyclododecene are strongly influenced by the electronic properties of the arylimido ligand. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To investigate the catalytic activity and stereoselectivity of NHC-supported (arylimido)niobium(V)–alkylidene complexes with fluorinated alkoxide ligands in the ring opening metathesis polymerization of norbornene and tetracyclododecene.

September 3, 2026Journal of the Japan Petroleum InstituteOpen Access

Ring Opening Metathesis Polymerization (ROMP) of Norbornene and Tetracyclododecene by NHC-supported (Arylimido)niobium(V)–alkylidene Catalysts Containing Fluorinated Alkoxide Ligand

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Authors

PLPloychompoo LoekukotTokyo Metropolitan University KNKotohiro NomuraTokyo Metropolitan University

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Implication

Experimental study demonstrates arylimido ligand control of activity and selectivity in cyclic olefin polymerization, indicating electronic effects govern niobium catalysis.

Key Points

To investigate the catalytic activity and stereoselectivity of NHC-supported (arylimido)niobium(V)–alkylidene complexes with fluorinated alkoxide ligands in the ring opening metathesis polymerization of norbornene and tetracyclododecene.
Synthesized and tested three niobium(V)–alkylidene catalysts bearing distinct arylimido ligands: pentafluorophenyl (1), 2,6-dichlorophenyl (2), and 2,6-difluorophenyl (3).
Evaluated the ring opening metathesis polymerization of norbornene at 25 °C and tetracyclododecene to assess living behavior, rate, and cis/trans double-bond selectivity.
Norbornene polymerization proceeded in a living manner at 25 °C, with the arylimido ligand significantly influencing catalytic activity and cis selectivity.
Catalyst 1 displayed the highest activity but lower cis selectivity than catalyst 3, whereas catalyst 2 displayed the lowest activity and cis selectivity.
Polymerization of tetracyclododecene showed the same activity hierarchy (1 > 3 > 2), indicating that electronic factors strongly influence the catalytic mechanism.

Cite This Study

Loekukot et al. (2026) studied this question.

synapsesocial.com/papers/6a9934cf636c6408cfa7c99f https://doi.org/10.1627/jpi.69.312

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Implication

Experimental study demonstrates arylimido ligand control of activity and selectivity in cyclic olefin polymerization, indicating electronic effects govern niobium catalysis.

Ring Opening Metathesis Polymerization (ROMP) of Norbornene and Tetracyclododecene by NHC-supported (Arylimido)niobium(V)–alkylidene Catalysts Containing Fluorinated Alkoxide Ligand

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Key Points

Cite This Study

Ring Opening Metathesis Polymerization (ROMP) of Norbornene and Tetracyclododecene by NHC-supported (Arylimido)niobium(V)–alkylidene Catalysts Containing Fluorinated Alkoxide Ligand

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