From Tetramethoxy Tellurium

Tetramethoxy tellurium and 2,2 -dilithiobiphenyl combine, to give 2,2 -biphenyldiyl 2-hiphenylyl telluronium hydroxide as, by-product .  

2 -Biphenyldiyl 2-Biphenylyl Telluronium Hydroxide A solution of 66.4 mmol of 2,2 -dilithiobiphenyl in 250 ml of dry diethyl ether is prepared under nitrogen and cooled to — 70°. A solution of 8.17 g (32.5 mmol) of tetramethoxy tellurium in 300 of diethyl ether is added dropwise, the mixture is allowed to warm to 20°, 

2-Biphenylyl tellurium trichloride evolved hydrogen chloride when heated by refluxing nitrobenzene (210°) for 20 min.  

Dibenzotellurophene re,71e-Dichloride 2.41 g (6.2 mmol) of recrystallized 2-biphenylyl tellurium trichloride are placed in an open test-tube which is heated in refluxing nitrobenzene for 20 min. The solid is recrystallized from 1,2-dibromobenzene crude yield 2.17 g (100%) m.p. 354° (dec.). 

2-Biphenylyl tellurium tribromide is reported to yield dibenzotellurophene dibromide when heated at its melting point of ISr .  

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Bis[2,2 -biphenyldiyl] Tellurium3 A solution of 66.4 mmol of 2,2 -dilithiobiphenyl in 250 ml of anhydrous diethyl ether is prepared from 26.9 g (66.4 mmol) of diiodobiphenyl and 132.8 mmol of butyl lithium and cooled to — 70°. 8.17 g (32.5 mmol) of tetramethoxy tellurium are dissolved in 300 ml of anhydrous diethyl ether and this solution is added dropwise to the cooled, stirred solution of 2.2 -dilithiobiphenyl. The resultant mixture is allowed to warm to 20° and is then heated under reflux for 60 h. The mixture is cooled to — 15° and unreacted lithium compound is destroyed by addition of methanol. The precipitate is collected, washed with water and then with diethyl ether yield 6.9 g (49%) m.p. 205-213° (dec. from tetrahydrofuran). 

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