Abstract
Abstract Nine mixed ligand ruthenium(II) vinylidene complexes with the general formula: [RuCl 2 {CCHR′}(PCy 3 )(L)] and [RuCl{CCHR′}(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 α,ω-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.
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