in hexane under Ar Fe-complex was suspended in hexane at 0°C, Ni-complex was added, stirred at 0°C for 45 min; filtered, evapd., detected by IR;

in hexane under Ar Fe-complex was suspended in hexane at 0°C, Ni-complex was added, stirred at 0°C for 45 min; filtered, evapd., detected by IR;

NaC5H5 in tetrahydrofuran few hours;;