Abstract
Vinylideneruthenium complexes with the general formula [RuCl 2(=C=CHR)L 2] (L = PPr 3 i , PCy 3, etc.) have been found to serve as good catalyst precursors with high efficiencies for ring-opening metathesis polymerization of cyclic olefins, ring-opening/cross-metathesis between norbornene derivatives and vinyl chalcogenides, ring-closing metathesis of α,ω-dienes, and ( Z)-selective dimerization of terminal alkynes. The complexes are easily prepared in high yields from [RuCl 2( p-cymene)] 2, L, and RCCH, which are all commercially available. Electron-donating substituents (R) at the β-carbon facilitate the alkyne–vinylidene tautomerization from both kinetic and thermodynamic points of view.
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