Synthese und dynamisches verhalten von einigen pentamethylcyclopentadienylsilanen und -germanen

By reaction of pentamethylcyclopentadienyllithium (pcpLi) with the corresponding chloro-silanes and -germanes, the h¹-pcp-silanes and -germanes I–IX are synthesized. Nucleophilic substitution reactions at the pcp-chlorogermane VII lead to the h¹-pcp-germanes X–XIII. The activation parameters for the sigmatropic rearrangements in these compounds have been evaluated from the ¹H DNMR data. They show little influence of the remaining ligands at silicon or germanium on the speed of these dynamic processes.