Me3NO in methanol; n-heptane; benzene addn. of Me3NO in MeOH under stirring over 2 h to the Fe compd. and phosphine in heptane-benzene under dry N2, stirring for 1 h and heating for 2 h at 70°C; cooling to room temp., concn., column chromy. (Florisil), elution with heptane, concg. 2nd band and storing at -10°C for 24 h yields Fe2 compd. (elem. anal.);