KI; SO2 in sulfur dioxide N2-atmosphere; condensation of SO2 onto Fe-complex (-78°C), addn.of excess KI, warming to -10°C (after 15 min), stirring (2 h); evapn., extn. into CHCl3, filtration, evapn. (reduced pressure), chromy.(Al2O3);

SO2 in pentane N2-atmosphere; passing SO2 through Fe-complex soln. (-75°C); solvent removal, chromy. (Florisil, CH2Cl2 or CHCl3);

SO2 in sulfur dioxide N2-atmosphere; standing of Fe-complex in SO2 at -18 to -35°C for several min; not isolated, detd. by IR and (1)H-NMR spectroscopy;

SO2 in sulfur dioxide N2-atmosphere; condensation of SO2 onto Fe-complex (-20 to -10°C), immediate evapn. at -10 to 0°C (during 10 min);

in dichloromethane under N2, Cp(CO)2FeCH2Cl combined with AgPF6 in dry degassed CH2Cl2 at -78°C, room-temp. soln. of Cp(CO)2FeCH2CH=CH2 in CH2Cl2 added immediately (but over 2 min) to stirred mixt., warmed to room temp.; filtered through Celite with acetone, evapd., filtrate rotary concd. (25 mm, 20°C), added dropwise to degassed Et2O, ppt. collected in filter, washed with Et2O, dried in N2 stream, Et2O filtrate and washings evapd.; NMR;

in hexane Irradiation (UV/VIS); N2-atmosphere; excess of alkyne, 250-W Hanovia lamp, 24 h, room temp.; removal of volatiles, chromy. (light petroleum, then Et2O), crystn.; elem. anal.;