chloro benzene in tetrahydrofuran under Ar, at room temp., 24 h; removal of solvent, addn. of toluene to residue, filtration, addn. of pentane to filtrate, filtration, standing of filtrate at -20°C, pptn. of a solid after 3 days, sepn. of ferrocene by sublimation (room temp./0.0001 Torr), elem. anal.;

in tetrahydrofuran under Ar, at room temp., 24 h; addn. of toluene to a mixture of the hydrido-complex and the butyl-complex, standing of soln. (2 h, 100°C), filtration after cooling, addn. of pentane to residue, ferrocene is obtained at -30°C, distn.of residue (vac.), elem. anal.;