n-butyllithium; N,N,N',N,-tetramethylethylenediamine; sodium hydrogencarbonate in diethyl ether; hexane Ar-atmosphere; addn. of BuLi (2.1 equivs.) to ferrocene derivative, addn. of TMEDA, stirring (>=20 h), addn. of ClPPh2, stirring (room temp., 10 h); addn. of aq. NaHCO3, extn. (CH2Cl2), solvent removal, chromy. (Al2O3, hexanes/Et2O=8:2); elem. anal.;