Modelling of Hexacoordinated Transition States of Germanium Based on the Crystal Structures of Germanium-substituted Bis(lactamo-N-methyl)germanes L2GeX2 and L2GeXY (X, Y = Hal, OTf, BF4, I3)

X-Ray structural data on the investigation of hypervalent organogermanium compounds testify to the absence of essential differences in the structural parameters between the series of penta- and hexacoordinated compounds, regarded as models for S_N-Si reactions.