SO2 in sulfur dioxide N2-atmosphere; refluxing (0.5 h); evapn., chromy. (Al2O3, C6H6, then CHCl3; or Florisil, CHCl3/Me2CO); elem. anal.;

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; evapn., chromy. (Florisil or Al2O3);

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);