Abstract Co-condensation of five equivalents Me 2 SiCl 2 and one equivalent RR′ SiCl 2 with lithium provides the five-and six-membered rings RR′ Si (Me 2 Si) 4 and RR′ Si (Me 2 Si) 5. This method provides a direct route to the phenyl substitued methylcyclopolysilanes (R, R′ Me, Ph) which can be used for further functionalization of the silicon rings. It also provides several news sterically hindered methylcyclopolysilanes (R, R′ Ph, Ph; Me, t- ...
