1: With n-butyllithium; N,N,N',N,-tetramethylethylenediamine in hexane T=20°C; Inert atmosphere; 2: With 1,2-dibromo-1,1,2,2-tetrachloroethane in tetrahydrofuran; dichloromethane T=-78 - 20°C; 5 h; Inert atmosphere;

1: biscyclopentadienyliron(II) With n-butyllithium; N,N,N',N,-tetramethylethylenediamine in hexane Inert atmosphere; 2: 1,1,2,2-tetrabromoethane in diethyl ether; hexane T=-78°C; 4 h;

H2O in diethyl ether 1,1,2,2-tetrabromoethane in Et2O was added slowly to suspn. FcLi2(TMEDA) in Et2O at -60°C, soln. was allowed to warm to room temp., stired for 10 h and hydrolyzed with H2O and stired for 10 min; organic layer was separated and evapd., residue was extd. with Et2O andfiltered, solvent was removed and residue was crystd. from MeOH;

in benzene (N2), stirred at reflux for 24 h; cooled, filtered, solvent removed in vacuum (recrystn. from MeOH possible);

in not given Fe-compound quenched with organic ligand;

Cu in neat (no solvent) (N2); heating a mixt. of iron complexes and activated Cu at 130-140°C for 24 h, cooling to room temp.; extn. with CH2Cl2, evapn., chromy. (alumina, hexane, CH2Cl2/hexane 1:9, then 1:1, ethyl acetate/CH2Cl2 1:99, then 5:95); elem. anal.;

n-butyllithium in tetrahydrofuran under N2; n-BuLi in THF added dropwise at -35°C to soln. of Fe complex in THF; stirred at -35°C for 1 h; H2O added dropwise; warmed to room temp. over 1 h; extd. with Et2O; org. layer collected; washed with H2O; dried (Na2SO4); solvent removed under reduced pressure; bromoferrocene contaminated withferrocene (10percent);

lithium diisopropylamide in tetrahydrofuran (Ar); std. Schlenk technique; soln. of Fe complex (0.5 equiv.) in THF was added to soln. of amide in THF; stirred between -50 to -80°C for 2 h; ClPPh2 (1 equiv.) was added; warmed to room temp. over 2 h; H2O added; org. phase septd.; aq. phase extd. (Et2O); dried (MgSO4); filtered; silica gel added; solvent removed; chromd. (Et2O/petroleum ether,Et2O); elem. anal.;

BuLi in tetrahydrofuran; hexane (Ar); soln. of BuLi in hexane was added to soln. of Fe complex in THF at-78°C; stirred at -78°C for 10 min; silane was slowly add ed; stirred at -78°C for 15 min and at room temp. for 90 min; satd. aq. NaHCO3 added; org. layer septd.; washed (brine); dried (MgSO4); evapd.; chromd. (silica gel, hexane);

n-butyllithium in tetrahydrofuran under N2; n-BuLi in THF added dropwise at -35°C to soln. of Fe complex in THF; stirred at -35°C for 1 h; H2O added dropwise; warmed to room temp. over 1 h; extd. with Et2O; org. layer collected; washed with H2O; dried (Na2SO4); solvent removed under reduced pressure; bromoferrocene contaminated withferrocene (10percent);