(1.621 g, 2 mmol) and KCp tt (1.299 g, 6 mmol). The light blue mixture was allowed to reflux for 16 hours. The solvents were removed in vacuo and toluene (30 mL) was added. The reaction mixture was allowed to reflux for 40 hours. The solvents were removed in vacuo to give a blue-green solid which was extracted with hexane (8 mL). The resultant green solution was concentrated to 2 mL and stored at 8 °C to afford a crystalline mixture of 3 (main product) and [Nd(Cp tt )3] (minor product). No further characterization data were obtained because the two complexes could not be separated. removed in vacuo and toluene (30 mL) was added. The reaction mixture was allowed to reflux for 40 hours. The resultant suspension was allowed to settle for 3 hours and filtered. The orange solution was concentrated to 2 mL and stored at 8 °C to afford [Sm(Cp tt )3] as orange crystals (0.716 g, 52%).