From Triphenylgermane -stannane, -plumbane tellurolates

Triphenylgermyl lithium and the corresponding tin and lead compounds undergo insertion of tellurium into the group IV element-lithium bond to produce lithium triphenylgermane (-stannane, -plumbane)tellurolates. These eompounds were not isolated but reacted with chlorotriphenylgermane, -stannane, and -plumbane to give symmetrical or unsymmetrical products  

Triphenylplumbyl Triphenylstannyl Tellurium All operations are performed under an atmosphere of nitrogen. 6.15 g (16 mmol) of chlorotriphenylstannane are dissolved in 20 ml of dry tetrahydrofuran and this solution is added dropwise to a well-stirred suspension of 0.62 g (80 mmol) of lithium in 20 ml of dry tetrahydrofuran. The mixture is stirred for 2 h, filtered through glass wool, and 2.0 g (16 mmol) of tellurium powder are added to the stirred filtrate at 20°. This mixture is stirred for 2h, 7.6 g (16 mmol) of chlorotriphenylplumbane dissolved in dry tetrahydrofuran are added dropwise, the resultant mixture is warmed gently, stirred for 2 h, and 150 ml of dry benzene are added. The mixture is filtered, the solvent is evaporated from the filtrate, and the residue is recrystallized from benzene/hexane yield 3.8 g (27%) m.p. 136° (dec.). 

Ethyl triethylsilyl and ethyl triethylgermyl tellurium reacted with triethylstannane at 20° to produce triethylsilyl (-germyl) triethylstannyl tellurium  

Triethylsilyl THethylstannyl Tellurium A two-necked, round-bottom flask fitted with a reflux condenser and a nitrogen inlet tube is flushed with nitrogen and charged with 7.14 g (35 mmol) of triethylstannane and 9.5 g (35 mmol) of ethyl triethylsilyl tellurium. The mixture is heated to 35° to initiate the reaction, the flask is cooled when the reaction becomes too vigorous. The reaction is allowed to preceed for 2 h. The resultant mixture is fractionated in a current of nitrogen under reduced pressure yield 14.2 g (91%) b.p. 109-112°/ torr. 

Triethylgermyl triethylstannyl tellurium (b.p. 128°/1 torr) was similarly prepared in 62% yield.  

---