The dilithium salt of the stannole [Li2(η 5 -L Sn )] (L Sn = [1,4-bis-(tert-butyl-dimethylsilyl)-2,3bis-phenyl-stannolediide]) was previously reported by Saito. However, attempts to perform salt metathesis reactions of the dilithiostannole with the dysprosium (pseudo)trihalides proved unsuccessful. The increased lattice energy of potassium (pseudo)halides was identified as potential solution to this problem. Consequently, the dipotassium salt of the stannole was prepared straightforwardly by reduction of the 1,1,3,4-tetraphenyl-2,5-bis-(tert-butyldimethylsilyl)-stannole with an excess amount of elemental potassium (Fig. ). Upon reduction, the color of the solution changed from yellow to dark brown. After filtration and evaporation of all volatiles, [K2(Et2O)0.45(η 5 -L Sn )] (1) was obtained in 69% yield and was used for the following reactions without further purification. The dipotassiostannolediide 1 was characterized by multinuclear NMR spectroscopy and single crystal X-ray diffraction (SCXRD) analysis. Single crystals of 1 were obtained from a THF/n-hexane mixture and the solid-state structure consists of a one-dimensional coordination polymer where each stannole ring is η 5 -coordinated by two K cations (Fig. ). Additionally, one of the two K cations is η 1coordinated to the Sn lone pair of the neighboring stannole ring, thus forming polymer chain.