Abstract
The nature of the apex-base bonds in organometallics of a novel class – pyramidanes [(Me3Si)4C4]E (E = Ge, Sn, Pb) was shown to be covalent but with a high degree of polarity on the basis of the Raman data and the results of QTAIM analysis. NICS data suggest three-dimensional aromaticity of the C4E pyramid.
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