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.;