BuLi in tetrahydrofuran byproducts: fluorene; (N2); BuLi dropped to (C5H5)CMe2(C9H7) in THF; (CpFe(fluorene))PF6 and BuLi in THF added; refluxed for 16 h; solution concentrated; mixture quenched with pentane and filtered over Al2O3; fluorene and ferrocene removed by sublimation at 50 °C; residue filtered with pentane over Al2O3; elem. anal.;

buthyllithium in tetrahydrofuran byproducts: fluorene; (N2); (C5H5)CMe2(C9H7) in THF deprotonated with BuLi at room temp; (CpFe(fluorene))PF6 reacted with BuLi in THF for 1 h; this soln. added to thefirst at 0°C; refluxed for 16 h; solvent removed; residue extracted with pentane/diethyl ether (1:1); filtered through Al2O3 column; isolated with hexane; fluorene and ferrocene removed by sublimation at 40 °C; elem. anal.;