Demethylation of the SMe2 substituent in cationic metallacarboranes. Halide anion influence

The room-temperature demethylation of the SMe2 group in reaction of (η-9-SMe2-7,8-Me2-7,8-C2B9H8)MBr2 (M = Rh, Ir) with CpTl is promoted by the bromide anion coordinated with metal atom. Demethylation by free halide ions is very slow at room temperature.294