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Abstract
The title compound was synthesized by a Wurtz-type condensation of dichlorotetramethyldisilane and trichloromethylsilane under selected conditions. Isolation from a mixture of several other permethylated cyclic, catenated and cage oligosilanes was achieved by RP-HPLC and RP-MPLC methods. ESR - investigations upon chemical reduction were carried out at different temperatures. Reactivity is shown to be distincly different to that of medium-sized monocyclic permethyloligosilanes. The isomeric bi(nonamethylcyclopentasilanyl) was also prepared and pathways to other oligocyclic methylsilanes are shown, starting from monofunctional cyclopentasilanes.