t-BuOK; n-BuLi in tetrahydrofuran; hexane dropwise addn. of BuLi (2.5 M, hexane, 1 h) to soln. (THF) of Cp-deriv. (-78°C), mixing with soln. (THF) of Fe-intermediate (made from t-BuOK and Fe-compd., 0°C, 30 min), heating (60°C, 6 h); cooling to room temp. extn. (hexane-water (+ HCl drop)), org. phase drying (MgSO4), concg., chromy. (SiO2, hexane);

in acetonitrile Electrolysis; electrolysis (-1.5 V vs. SCE, Hg cathode, N2 atmosphere, in dark, 0.2 MLiClO4, few min); solvent removal;

aluminium trichloride; aluminium in water other Radiation; 0.02 mol metal addn. to arene, Fe- and Al-salts mixt. in 1,2,4-C6H3Cl3 (ratio arene:Fe:AlCl3:Al=1:2:4:3.7), homogenization (stirring), mixt. irradiation in microwave oven (850 W) for 3 min, ice addn. (AlCl3 decompn.), filtration, filtrate washing (Et2O); filtration, treating with aq. NH4-salt, ppt. filtration off through sinter, washing (i-PrOH, Et2O);

oxygen in tetrahydrofuran addn. of O2 at -80°C under dry N2;

t-BuOK; n-BuLi in tetrahydrofuran; hexane dropwise addn. of BuLi (2.5 M, hexane, 1 h) to soln. (THF) of Cp-deriv. (-78°C), mixing with soln. (THF) of Fe-intermediate (made from t-BuOK and Fe-compd., 0°C, 30 min), heating (60°C, 6 h); cooling to room temp. extn. (hexane-water (+ HCl drop)), org. phase drying (MgSO4), concg., chromy. (SiO2, hexane);