dicobalt octacarbonyl in hexane 16 h; Ambient temperatureIrradiation;

triethylamine in dichloromethane T=0 - 20°C; Wittig reaction; 24 h;

triethylamine in dichloromethane T=0 - 20°C;

in methanol stirring, room temp., 24 h; the mixture of the two iron complexes (orange oil) was not amenable to chromatographic sepn.; evapn. (vac.), addn. of H2O, extn. (Et2O); evapn., TLC (petr. ether/Et2O 9:1), elution (CHCl3), evapn. (vac.), dissolving (petr. ether/Et2O 9:1), keeping at -15 °C (pptn. of the allene); evapn. to dryness in vac.; IR, MS, (1)H-NMR;

in benzene