Tris ditellurium

Ditellurium Tris[bis(2-hydroxyethyl) dithiocarbamate] Thiocyanate1 31 mg (0.1 mmol) of tellurium bis[bis(2-hydroxycthyl)dithiocarbamate] are dissolved in 5 ml of acetone. A solution of 0.29 g (3 mmol) of potassium thiocyanate in 10 ml of 3 M acetic acid is added. The reaction mixture is stirred and kept in a Petri dish at room temperature. Over night, deep-red, needle-shaped crystals separated. The crystals are filtered, washed with 1 M acetic acid and then with diethyl ether, and finally dried over anhydrous calcium chloride yield 80% dec. > 100° (TGA). The bromide and iodide derivatives were similarly prepared in the same yield. 

Bis[4-methylphcnyl] ditellurium combined with white phosphorus in acetone at 30° to form crystals of tris[4-methylphenyltelluro phosphanel. 

Bis[4-methylphenyl] ditellurium and tri(t-butyl)cyclotriphosphane produced l,2-bis[4 -methylphenyltelluro]-1,2-di( t-butyl) diphosphane3. 

Diaryl ditellurium compounds and tetrakis[triphenylphosphane]palladium reacted in benzene to form the dinuclear complex bis[/r-arenetellurolato]bis[arenetellurolato]bis[tri-phenylphosphane]dipalladium3. 

The stable tris[trimethylsilyl]methyl tellurium halides were obtained in quantitative yields from the corresponding ditellurium and the elemental halogens4. 

Treatment of aryl tellurium halides with base (ethanolic potassium hydroxide6, aqueous sodium hydroxide7, triethylamine8, tris[< -propyl] phosphite8, triphenylphosphane8) leads to the formation of diaryl ditellurium compounds (p. 273). In the hydrolytically induced disproportionation reactions, aryl tellurinic acids are the other tellurium-containing products7,9. 

Bis[4-methoxyphenyl] ditellurium was converted to 4-methoxyphenyl tellurium tris[dithio-carbamates] by reaction with bis[thiocarbamoyl] disulfides in refluxing chloroform1. 

Dimethyl ditellurium, but not diphenyl ditellurium, reacted with trichlorocyclopropenium salts6 or with tetrabromocyclopropene7 to give tris[methyltelluro]cyclopropenium compounds. 

Diaryl ditelluriums and bis[thiocarbamoyl] disulfides reacted in hot chloroform to give aryl tellurium tris[dithiocarbamates]1. 

Dimethyl ditellurium reacted with trichlorocyclopropenium salts3 and with tetrabromocy-clopropene4 to produce tris[methyltelluro]cyclopropenium salts. 

The bis[organotelluro] selenium compounds in solution are in equilibrium with the diorgano ditellurium and the bis[organotelluro] diselenium. Only the tris[trimethylsilyl] methyl compounds are kinetically stabled... 

Bi [tricarbonylbenzenetellurolatoiron] 3.28 g (8 mmol) of diphenyl ditellurium and 2.52 g (5.0 mmol) of tris[tetracarbonyhron] are dissolved in 100 m/ of benzene, the solution is heated under reflux for 1 h, and filtered. The filtrate is evaporated to dryness under reduced pressure and the residue is recrystallized twice from dichloromethane/hexane yield 3.2 g (60%) m.p. 106° (dec.). 

A benzene solution of diphenyl ditellurium and tris[tetracarbonylruthenium] heated at 60" for four hours formed bis[tricarbonylbenzenetellurolatoruthenium] and oligomeric di-carbonylbis[benzenetellurolato]ruthenium. The reaction mixture was chromatographed on silica gel to separate these compounds ... 

Tris[trimethylsilyl]methyl Tellurium Chloride 1.00 g (1.4 mmol) of bis[tris(trimethylsilyl)methyl] ditcllurium is dissolved in 20 ml tetrahydrofuran. O.li ml (1.4 mmol) of sulfurylchloride dissolved in 20 ml tetrahydrofuran are added dropwise to the stirred solution of the ditellurium compound at 20°.The solvent is removed from the dark-blue solution under a vacuum. The residue is recrystaUized from isopropanol. The blue-black crystals begin to decompose at 110°. 

The reduction of alkyl tellurium tri halides is a convenient method for the preparation of the corresponding dialkyl ditellurium when the trihalides can be obtained by reactions other than the halogenolysis of the dialkyl ditellurium. Addition of tellurium tetrachloride to olefins and condensation with ketones produces alkyl tellurium trichlorides. Sodium sulfide nonahydrate" and sodium or potassium disulfite were used as reducing agents. 

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