Abstract

Reaction of acetylene with Cp*Ru(P i Pr 3 )Cl or [Cp*Ru(μ 3 -Cl)] 4 (Cp*=η 5 -C 5 Me 5 ) gives good yields of the dinuclear ruthenacyclopentadiene complex Cp*Cl 2 Ru(η 2 :η 4 -μ 2 -C 4 H 4 )RuCp* (1). Alkylation of 1 with MeMgBr affords the dimethyl complex Cp*Me 2 Ru(η 2 :η 4 -μ 2 -C 4 H 4 )RuCp* (2). Reaction of [Cp*Ru(μ 3 -Cl)] 4 with Me 3 SiC≡CH produces the cyclobutadiene complex Cp*Ru[η 4 -C 4 H 2 (SiMe 3 ) 2 ]Cl (3). If [Cp*Ru(M 3 -Cl)] 4 is allowed to react with a limited amount of Me 3 SiC≡CH (ca. 1 equiv), a triruthenium cluster containing one alkyne ligand may be isolated in high yield. This compound, Cp* 3 Ru 3 (μ 2 -Cl) 2 (μ 3 -Cl)(η 2 -μ 2 -HC≡CSiMe 3 ) (5), is unstable in solution but was characterized in the solid state by X-ray crystallography

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