dichloromethane in tetrahydrofuran THF was distilled onto Te powder under N2, frozen (-196°C), MeLi syriged in, mixt. was allowed to thaw, after Te dissolution mixt. was refrozen (-196°C), CH2Cl2 added, warmed to room temp.; mixt. was hydrolyzed (satd. aq. NaCl), org. phase septd., dried, evapd. in vacuo; good yield;

1: dimethyl ditelluride With potassium hydroxide; hydrazine hydrate T=80 - 85°C; 2 h; 2: dichloromethane T=40 - 42°C; 1 h;

1: dimethyl ditelluride With potassium hydroxide; hydrazine hydrate T=80 - 85°C; 2 h; 2: With potassium hydroxide; selenium; hydrazine hydrate T=80 - 85°C; 3: dichloromethane T=40 - 42°C; 3 h;

1: dimethyl diselenide With potassium hydroxide; hydrazine hydrate T=80 - 85°C; 2 h; 2: With potassium hydroxide; tellurium; hydrazine hydrate 3: dichloromethane T=40 - 43°C; 3 h;

1: dimethyl-disulfide With potassium hydroxide; hydrazine hydrate T=80 - 85°C; 2 h; 2: With potassium hydroxide; tellurium; hydrazine hydrate 3: dichloromethane T=40 - 43°C; 3 h;