Easily accessible and robust olefin-metathesis catalysts based on ruthenium vinylidene complexes

✍ Scribed by Tom Opstal; Francis Verpoort

• Book ID: 104422370
• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 247 KB
• Volume: 200
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/s1381-1169(03)00099-2

✦ Synopsis

Nine mixed ligand ruthenium(II) vinylidene complexes with the general formula: [RuCl 2 {=C=CHR }(PCy 3 )(L)] and [RuCl{=C=CHR }(PCy 3 )(sal-R)] (L = N -heterocyclic carbene, sal-R = salicylaldiminate anion, R = Ph, SiMe 3 , t But) has been synthesized and characterized. These complexes are easily accessible from [RuCl 2 ( p-cymene)] 2 , terminal alkynes, imidazolium salts or salicylaldimine salts and they have been found to serve as good catalyst precursors for ring-opening metathesis polymerization (ROMP) of norbornene, substituted norbornenes, polycyclic alkenes and cyclooctene and ring-closing metathesis (RCM) of ␣,-dienes. Furthermore, these precursors possess extremely high stability toward air, heat and moisture in comparison with other metathesis-active alkylidene ruthenium systems. No significant catalyst decomposition was found for several days at elevated temperatures.