Stannabenzenylpotassium: The First Isolable Tin-Containing Benzene Derivative

In contrast to the well-investigated sila- and germa-aromatic compounds, very few aromatic compounds containing tin have been reported. Specifically, no stable example of monomeric stannabenzene, that is, the tin analogue of benzene, the simplest aromatic compound, has been isolated until now. In this work, a tin analogue of the phenyl anion, the stannabenzenyl anion, was successfully isolated by utilizing the same strategy as employed for the germanium system. Stannabenzenylpotassium was characterized by X-ray crystallography, NMR (¹ H, ¹³ C, and ¹¹⁹ Sn) and UV/Vis spectroscopy, together with theoretical calculations.