Abstract 1-Lithio-1-phenyl- and 1-lithio-1-trimethylsilylstannoles were synthesized and the corresponding lithium salts of stannole anions were characterized by X-ray diffraction analysis. The five-membered rings of the two lithium salts are planar with remarkable alternation of the C–C bonds, suggesting that they are both non-aromatic. Theoretical calculations are also carried out to discuss their electronic nature.
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Saito et al. (2010) studied this question.
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