Abstract
AbstractThe action of the α‐, β‐ and γ‐diols on the dialkyl(aryl)‐bis(dialkylamino) germanes R2Ge(NR'2)2 leads, in high yields, to the dialkyl(aryl)‐2,2‐germa‐2‐dioxa‐1,3‐cycloalkanes.The IR. and NMR. spectral study in the presence of Eu(Dpm)3 allowed to demonstrate a dimerisation by coordination in some of these heterocycles. In this complex, the germanium is hexacoordinated by association with the two oxygens of the second associate molecule. Its hybridation state is sp3d2 or spd4 (D3h symmetry, prismatic structure).These low energy association are ruptured in solution at moderate temperatures; these heterocycles are monomers by ebulliometry in benzene.This association is disfavoured by the presence of substituents on the cycle and by hindering substituents with donor effect on the germanium.The diminution of nucleophilicity of the oxygens by mesomeric effect with neighbouring π systems also prevents any association.
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