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Polymers 2016, 8(2), 31; doi:10.3390/polym8020031

Highly Active and Isospecific Styrene Polymerization Catalyzed by Zirconium Complexes Bearing Aryl-substituted [OSSO]-Type Bis(phenolate) Ligands

Department of Chemistry, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama 338-8570, Japan
Authors to whom correspondence should be addressed.
Academic Editor: Changle Chen
Received: 17 December 2015 / Revised: 13 January 2016 / Accepted: 20 January 2016 / Published: 26 January 2016
(This article belongs to the Special Issue Metal-Mediated Polymer Synthesis)
View Full-Text   |   Download PDF [690 KB, uploaded 26 January 2016]   |  


[OSSO]-type dibenzyl zirconium(IV) complexes 9 and 10 possessing aryl substituents ortho to the phenoxide moieties (ortho substituents, phenyl and 2,6-dimethylphenyl (Dmp)) were synthesized and characterized. Upon activation with dMAO (dried methylaluminoxane), complex 9 was found to promote highly isospecific styrene polymerizations ([mm] = 97.5%–99%) with high molecular weights Mw up to 181,000 g·mmol−1. When the Dmp-substituted pre-catalyst 10/dMAO system was used, the highest activity, over 7700 g·mmol(10)−1·h−1, was recorded involving the formation of precisely isospecific polystyrenes of [mm] more than 99%. View Full-Text
Keywords: zirconium; post-metallocene; styrene polymerization; [OSSO]-type ligand; isotactic zirconium; post-metallocene; styrene polymerization; [OSSO]-type ligand; isotactic

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Nakata, N.; Toda, T.; Saito, Y.; Watanabe, T.; Ishii, A. Highly Active and Isospecific Styrene Polymerization Catalyzed by Zirconium Complexes Bearing Aryl-substituted [OSSO]-Type Bis(phenolate) Ligands. Polymers 2016, 8, 31.

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