in cyclohexane Irradiation (UV/VIS); irradiating cyclohexane soln. of 3-alkylidenethiagermirane and 2,3-dimethyl-1,3-butadiene (low-pressure mercury lamp, 6 h, room temp.); preparative TLC (silica gel, benzene/hexane 1:3);

in cyclohexane Irradiation (UV/VIS); irradiating cyclohexane soln. of 3-alkylidenethiagermirane and 2,3-dimethyl-1,3-butadiene (low-pressure mercury lamp, 6 h, room temp.); preparative TLC (silica gel, benzene/hexane 1:3);

in benzene flow copyrolysis of benzene soln. of 3-alkylidenethiagermirane and 2,3-dimethyl-1,3-butadiene (500°C, nitrogen flow 10 ml/min, trapping pyrolysate in a receiver cooled by dry ice-MeOH); preparative TLC (silica gel, benzene/hexane 1:3);