The siliconium ion question

The hydrolysis reaction of (amido)dimethylchlorosilanes 1, 5, containing pentacoordinate silicon atom involved in the intramolecular coordination bond CO → Si, and the solvate complexes of 1 with water molecules 2–4 leading to silanol hydrochlorides was studied computationally at the B3LYP/6-311+G∗∗ and MP2/6-311G∗∗ levels of theory. Transition states of the hydrolysis of reactants 1–5 have a similar structure and contain a hexacoordinate...