Phenyl from diphenyl tellurium dichloride

Tetraphenyl Tellurium1 3.53 g (10 mmol) of diphenyl tellurium dichloride are suspended in 30 ml of anhydrous diethyl ether and, under dry nitrogen, 25 ml (26 mmol) of a lithium bromide-free solution of phenyl lithium in diethyl ether are added. Crystals of tetraphenyl tellurium are filtered off, the filtrate is concentrated, the concentrate is cooled to — 10°, and the precipitated product is collected. The combined crystals are dissolved in benzene, the solution is filtered, and the filtrate is evaporated to dryness under reduced pressure. The residue is recrystallized from 35 ml of anhydrous diethyl ether yield 2.3 g (52%) m.p. 104-106° (dec.). 

Diphenyl Tellurium Bis[0-alkyl dithiocarbonates]1 A solution of 7.7 g (21.75 mmol) of phenyl tellurium dichloride in 20 ml absolute tetrahydrofuran is cooled to — 40°. A freshly prepared solution containing the stoichiometrically required amount of sodium O-alkyl dithiocarbonate is slowly dropped to the tellurium compound. The mixture is stirred for 1 h and allowed to warm to 0". The sodium chloride is removed by filtration. The filtrate is concentrated at 0° under reduced pressure to one third of its volume. The solid is collected by filtration and recrystallized from cold petroleum ether or chloroform/pentane mixtures. These operations should be carried out quickly to avoid the decomposition of the products in the dissolved state. Prepared in this or similar manner were ... 

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