hydrogenchloride in tetrahydrofuran; N,N-dimethyl-formamide to a soln. of Fe-compd. in DMF is added dropwise C2H4Br2 (50°C), the mixt. is stirred 22 h at 80°C, the suspn. is filtered and dried, addn. of boiling THF and HCl (reactions under N2); removing of volatile components in vac., the residue is extracted with CH2Cl2, removing of solvent, identification of products by spectroscopic methods (1H-NMR, FD-mass-spectra);