KH in tetrahydrofuran Ar-atmosphere; stirring Fe-complex with KH at room temp. for 14 h, addn.to Re-complex at -78°C, warming to room temp., stirring for 24 h; centrifugation, evapn., chromy. (SiO2, petroleum ether, then petroleum ether/AcOEt=3:2), solvent removal; elem. anal.;