The dipotassium stannole 1 (0.144 g, 0.217 mmol) and anhydrous TbI3 (0.058 g, 0.108 mmol) were placed together in a J. Young Schlenk flask. THF (ca. 5 mL) was condensed to the flask at -88 °C and the solution was allowed to warm up to room temperature and stirred for 16 h at room temperature. During this time, colorless insoluble materials (KI) formed. After filtration, the solution was concentrated to ca.