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Chinese Journal of Polymer Science

, Volume 37, Issue 10, pp 943–950 | Cite as

(Arylimido)vanadium(V)-Alkylidene Complexes as Catalysts for Ring-opening Metathesis Polymerization (ROMP) of Cyclic Olefins: Ligand Design for Exhibiting the High Activity

  • Kotohiro NomuraEmail author
  • Sapanna Chaimongkolkunasin
Feature Article
  • 18 Downloads

Abstract

(Imido)vanadium(V)-alkylidene complexes of type V(CHSiMe3)(NR)(OR′)(PMe3)2 [R = Ad, C6H5, 2,6-Me2C6H3, 2,6-Cl2C6H3; R′ = 2,6-Me2C6H3, 2,6-iPr2C6H3, 2,6-F2CeH3, C6F5, C6Cl5] exhibited from moderate to remarkable catalytic activities for ring-opening metathesis polymerization (ROMP) of norbornene (NBE). The catalytic activities were affected by the ligand substituents, and V(CHSiMe3)(N-2,6-Cl2C6H3)(OC6X5)(PMe3)2 (X = F, Cl) demonstrated the exceptionally high catalytic activities for ROMP of NBE. The complexes polymerized cycloheptene (CHPE) and cis-cyclooctene (COE), and ROMP of COE by the OC6Cl5 analogue proceeded in a living manner even at 80 °C, and the activity increased with increasing the temperature up to 120 °C. Highly active catalysts for ROMP of cyclic olefins (NBE, cyclopentene, and CHPE) can be generated in situ by premixing isolated V(CHSiMe3)(NC6F5)(O-2,6-iPr2C6H3)(PMe3)2 with 1.0 equiv. of C6F5OH or C6Cl5OH via immediate phenoxy exchange; the activity was affected by the kind of phenol added [TOF in the ROMPs of NBE: 4.62 × 104 min−1 (upon addition of C6F5OH) versus 37.3 min−1 (none)].

Keywords

Olefin metathesis Molecular catalyst Ring-opening metathesis polymerization Cyclic olefin Vanadium catalyst 

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Notes

Acknowledgments

K. N. expresses his heartfelt thanks to former/present group members who contributed this project as coauthors, and the other members for discussion/supports. This project was partly supported by Grant-in-Aid for Scientific Research on Innovative Areas (“3D Active-Site Science”, No. 26105003) from The Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan, and Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS, Nos. 15H03812, 18H01982). S. C. acknowledges the Tokyo Metropolitan government (Tokyo Human Resources Fund for City Diplomacy) for pre-doctoral fellowship.

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Copyright information

© Chinese Chemical Society Institute of Chemistry, Chinese Academy of Sciences Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Chemistry Graduate School of ScienceTokyo Metropolitan UniversityTokyoJapan

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