Work

High Temperature Ring Opening Metathesis Polymerization (ROMP) of Low Strained Cycloheptene and Cis-Cyclooctene by (Arylimido)Niobium(V)–Alkylidene Catalysts

Year: 2024

Type: article

Abstract: Ring opening metathesis polymerization (ROMP) of cycloheptene (CHPE) and cis-cyclooctene (COE) was investigated using (arylimido)niobium(V) catalysts containing the fluorinated alkoxide ligands, Nb(CHSiMe3)-(NAr)[OC(CF3)3](PMe3)2 (Ar＝2,6-Cl2C6H3, C6H5, 2,6-F2C6H3, C6F5), and their halogenated phenoxide ana-)2 exhibited superior catalytic activity for ROMP of COE especially at 80 °C and 100 °C [ex.TOF 18,900 h -1 (5.26 s -1 ) after 2 min at 100 °C], and the polymerizations proceeded in a living manner without catalyst deactivation.Cis-specific ROMPs of CHPE and COE were demonstrated by Nb(CHSiMe3)(NC6H5)[OC(CF3)3](PMe3)2 and the activities increased at 80 °C, but certain degree of second metathesis (presumably backbiting) also occurred in the ROMP of CHPE even at 80 °C and in the ROMP of COE at 50 °C.

Source: Journal of the Japan Petroleum Institute

DOI: 10.1627/jpi.67.176

Authors: Nao HAMAKAWA, Kanchana CHATCHAIPAIBOON, Kotohiro NOMURA

Institution: Tokyo Metropolitan University

Language: English

Topic: Synthetic Organic Chemistry Methods

Subfield: Organic Chemistry

Field: Chemistry

Domain: Physical Sciences

Open Access status: diamond

Funders: Tokyo Metropolitan Government, Japan Society for the Promotion of Science

Awards: Development of Efficient Transition Metal Complex Catalysts for Efficient Olefin Polymerization/Dimerization, New Functional Polymeric Materials, Development of Efficient Molecular Catalysts for Efficient Olefin Polymerization/Dimerization, New Sustainable Advanced Polymeric Materials