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The arene ligand exchange mechanism of slipped arene triple deckers [Bis{(η 5 -Cp R )Co}-μ-{η 4 :η 4 -arene}] (R = Me 5 , 1,2,4 tri-tert butyl, arene = benzene, toluene) 1 was studied by  1 H-NMR spectroscopy for different concentrations and solvents. It has been found that triple deckers of type 1 decompose slowly in solution. A unique equilibrium, between these triple deckers and the mixed sandwich complexes [(η 6 -arene)Co(η 5 -Cp R )] and 14 e [(η 5 -Cp)Co] solv  fragments generated in situ by decomposition o f 1 exists. In addition to this equilibrium arene lability of the thus formed mixed sandwich complex type has been detected by NMR making slipped triple deckers 1 ideal single source compounds for the generation of two [(η 5 -Cp)Co] fragments in one reaction step. Such fragments are valuable metal ligand components with high synthetic utility in organometallic chemistry.

zeitschrift für naturforschung b

Mechanistische Untersuchungen zum reversiblen Gleichgewicht von metallorganischen Tripeldecker- und Sandwichkomplexen des Typs [Bis{(η 5 -Cp R )Co}-μ-{η 4 :η 4 -aren}] und [(η 5 -Cp R )Co(η 6 -aren)] / Mechanistic Studies towards the Reversible Equilibrium between Metal Organic Triple Decker and Sandwich Complexes [Bis{(η 5  -Cp R )Co}-μ-{η 4  :η 4 -arene}] and [{(η 5 -Cp R )Co(η 6 -arene)]