in hexane Irradiation (UV/VIS); irradiation (PRK-7 lamp, 10 h, -50 to -70°C); evapn., distn. (vac.); elem. anal.;

dibenzoyl peroxide in hexane Irradiation (UV/VIS); mixt. of stannane, dithiol and benzoyl peroxide in hexane irradiated with UV light for 50 h at -50 to -70°C under stirring; solvent removed under reduced pressure at room temp.; residue passed through silica column with C6H6 as eluent;