the coordination of one1 234 56or two solvent molecules.30 Our results suggest that there is an energetically accessible transition state through which these compounds could pass without the need of solvent to form a penta-or hexacoordinate transition state. Thus it is quite possible that the loss of optical activity is due to an energetically accessible edge inversion pathway. This can also be extended to silicon systems.There is one reported31 experimental example (1) of a lowenergy inversion process at Si with AE = ~26 kcal/mol. The value of 26 kcal/mol for AE is not inconsistent with the value of AE found for SiF4 since the ligands bonded to silicon are so different. Indeed, the lower value of 1 is consistent with what is observed in ADPO (2) as compared to PF3. ADPO is known (31) Martin,

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