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 1H, 13C, and 29Si NMR spectroscopic data of
this novel hypercoordinate silicon complex.