BuLi in tetrahydrofuran byproducts: fluorene; (N2); (cycloctadiene)Mn(C5H4)CMe2(C9H7) deprotonated by BuLi in THF; (CpFe(fluorene)PF6 and BuLi in THF added at 0 °C after 1 h; refluxedfor 16 h; solvent removed; solid extracted by pentane/diethyl ether(1:1); fluorene and ferrocene removed by sublimation at 50 °C; residue filtered through Al2O3 column with pentane; eluted with pentane/diethyl ether; elem. anal.;