in deuterated toluene byproducts: dimethylsulfide, H3BS(CH3)2, F3BS(CH3)2; (inert atm.); addn. of tin compd. to Se compd. in toluene-d8 at room temp., stirring for 1 h at room temp., centrifugation, standing at room temp. for 3 d;

in deuterated toluene (inert atm.); addn. of tert-butanol to suspn. of Se compd. in toluene-d8at -30°C, heating to 40°C for 30 min; evapn. in vac.;