Ring-opening metathesis polymerization of 7-phenylnorbornadiene and benzonorbornadiene

✍ Scribed by James G. Hamilton; John J. Rooney; David G. Snowden

• Publisher: John Wiley and Sons
• Year: 1995
• Tongue: English
• Weight: 536 KB
• Volume: 196
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1995.021960406

✦ Synopsis

Ring-opened metathesis polymers of 7-phenylnorbornadiene and benzonorbornadiene have been prepared using a variety of catalysts based on Ru, Os, Ir, W and Mo chloride salts and complexes. Detailed "C and 'H NMR spectra of these materials and their corresponding hydrogenated derivatives have been obtained and analysed for information concerning tacticities and fractions of cis double bonds (uc). The behaviour of 7-phenylnorbornadiene is similar to that of 7-methylnorbornadiene in that a strong preference for the anti over the syn mode of monomer insertion is observed in contrast to 7-tert-butoxynorbornadiene which shows little or no regioselectivity. Pronounced effect on uc are also observed using the OsCI, catalyst as expected from previous experience of ring-opening metathesis polymerization (ROMP) systems containing chelating dienes and this catalyst. Weaker effects of this type due to complexation of monomer as a spectator ligand are also indicated for the polymerization of benzonorbornadiene; these are also compared to the effects of using Michael acceptor additives in metathesis systems.