Chemical and electrochemical oxidation of permethylmetallocenecarbaldehydes and the related μ-acyl Os3-clusters

Oxidation of nonamethylmetallocenecarbaldehydes C₅Me₅MC₅Me₄CHO (M=Ru or Os) and the related μ-acyl clusters C₅Me₅MC₅Me₄COOs₃(CO)₁₀H with silver salts afforded η⁶-metallonium cations, whose structures and compositions were confirmed by the data of elemental analysis and¹H,¹⁹F, and¹³C NMR and IR spectroscopy. The results of studies by cyclic voltammetry demonstrated that oxidation of the compounds under study proceeded through 17-electron radical-cationic intermediates and that the μ-acyl Os₃-cluster fragment is a weaker electron-withdrawing group than the CHO group. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 789–793, April, 1999.