Reaktionen von Dicarbonyl (η-cyclopentadienyl)(propiolsäuremethylester)niangan(I) mit Basen. Isolierung von Vinyliden- und Carbenkomplexen / Reactions of Dicarbonyl(η-cyclopentadienyl)(methylpropiolate)manganese(I) with Bases The Isolation of Vinylidene and Carbene Complexes

Abstract

Reaction of dicarbonyl(η-cyclopentadienyl)(methylpropiolate)manganese(I) with various stoichiometric quantities of tert-butyl lithium and subsequent addition of HCl or CH₃OSO₂F allows the isolation of vinylidene complexes of the general type CpMn(CO)₂=C=CR₁R₂ R₁=H, CH₃; R₂ = COOCH₃, COt-Bu, COH(t-Bu)₂). The compound with R₁=H, R₂₌COOCH₃ adds another CpMn(CO)₂ fragment, with formation of a bridged vinylidene species with a Cp₂Mn₂(CO)₄ unit. The reaction with amide or methoxide leads to the formation of carbene complexes CpMn(CO)₂ = C(R₁)CH₂-COOCH₃ (Rx = NH₂, OCH₃).