in toluene under N2; addn. of α-imino ketone to stirred suspn. of Fe2(CO)9 in toluene, stirring for 14 h at room temp.; evapn., column chromy. (SiO2, pentane for Fe3(CO)12, 6:2 pentane/Et2O for Fe2(CO)6 complex), crystn. from 5:1 pentane/Et2O (Fe2(CO)6 complex);

triethylamine in dichloromethane T=30°C; 3 h;

trimethylsilyl trifluoromethanesulfonate in 1,2-dichloro-ethane 2 h; Heating;

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