In the system 1-sila-2,4-cyclohexadiene (l)/tert-butyllithium/trimethylchlorosilane the following reaction types have been observed: nucleophilic substitution, metallation, addition of tert-butyllithium to the diene fragment, addition of lithium hydride to the diene fragment, silicon-carbon bond cleavage, and transmetallation. The resulting products 2-11 have been characterised by their 1H and 13C NMR data; the compounds 2, 3, 6, 8 and 10 could be isolated in a pure form. The relative quantities obtained of the compounds 2-11 depend on the reaction conditions (solvent, temperature, order of addition).
Silicon-Carbon bond cleavage reactions of Ansa tungstenocene compounds: The [Me2Si] bridge as a site for metallocene functionalization