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Updated: Jun 13, 2025

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
Published on: December 16, 2022
Snapshot of cyclooctyne ring-opening to a tethered alkylidene cyclic polymer catalyst
Javier M Hurst1, Rinku Yadav1, Parker T Boeck1,2
1University of Florida, Department of Chemistry, Center for Catalysis P.O. Box 117200 Gainesville FL 32611 USA veige@chem.ufl.edu.
Abstract:
Cyclooctyne reacts with the trianionic pincer ligand supported alkylidyne [ t BuOCO]WCC(CH3)3(THF)2 (1) to yield tungstacyclopropene (3) and tungstacyclopentadiene (4) complexes. The ratio of 3 and 4 in the reaction mixture depends on the stoichiometry of the reaction. The maximum concentration of 3 occurs with one equiv. of cyclooctyne and 4 is the exclusive product of the reaction above three equivalents. Both complexes 3 and 4 convert to the cyclooctyne ring-opened product 5 upon heating. While the conversion of 4 to 5 is accompanied by formation of polycyclooctyne as a white precipitate during the reaction, conversion of 3 to 5 is homogeneous. Exhibiting Ring Expansion Polymerization (REP), complexes 4 and 5 initiate the polymerization of phenylacetylene to generate cyclic poly(phenylacetylene) (c-PPA).
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