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Ring-Opening Metathesis Polymerization of Nitrile Substituted cis-Cyclooctenes

✍ Scribed by Martin F. Schneider; Carola Gantner; Werner Obrecht; Oskar Nuyken

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
158 KB
Volume
31
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

New nitrile‐containing polymers have been synthesized by ring‐opening metathesis polymerization of cis‐cyanocyclooct‐4‐ene and cis‐1,2‐dicyanocyclooct‐5‐ene with a 2^nd^ generation Grubbs catalyst [(H~2~IMes)(PCy~3~)Cl~2~Ru = CHPh] (H~2~IMes = N,N′‐bis(mesityl)‐4,5‐dihydroimidazol‐2‐ylidene). With increasing content of nitrile moieties on the cyclooctene ring the reaction rates decrease from cis‐cyclooctene to cis‐cyanocyclooct‐4‐ene and cis‐1,2‐dicyanocyclooct‐5‐ene. Contrary to commercially available nitrile rubbers (unhydrogenated and hydrogenated butadiene/acrylonitrile copolymers) in which double bonds, nitrile moieties, and methylene bridges are randomly distributed along the main chain, the new polymers show a regular distribution of structural entities.

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