Activation of a Si−Si Bond by Hypercoordination: Cleavage of a Disilane and Formation of a Si−C Bond

The disilane derivative 2-(dichloromethylsilyl)-2-methyl-1,3-diphenyl-1,3,2-diazasilolidine was reacted with a salen-type tetradentate ligand to yield a pentacoordinate methylsilane with a silylated ligand. This surprising rearrangement reaction with Si−Si bond cleavage and Si−C bond formation at 0 °C without a catalyst and without special external energy input such as irradiation is confirmed by X-ray structure analysis as well as 1 H, 13 C, and 29 Si NMR spectroscopic data of this novel hypercoordinate silicon complex.