Diphenyl- telluronium chloride

Aryl tellurium trihalides accept halide ions from tropylium bromide, ammonium halides, phosphonium halides, arsonium halides, sulfonium chlorides, telluronium chlorides, and diphenyl iodonium chloride to form aryltetrahalotellurates(lV)1-5. 

TViphenyl Telluronium Cyanate1 0.15 g (1 mmol) of silver cyanate are dissolved in 850 ml of boiling water, 0.394 g (1 mmol) of triphenyl telluronium chloride dissolved in 50 ml of hot water are added, the mixture is stirred for several minutes, then cooled, and filtered. The filtrate is concentrated to a volume of 5 ml under vacuum, and the concentrate is cooled to 5° and filtered, The filtrate is allowed to stand for 48 h open to the atmosphere, the crystals are collected, crushed, and dried at 24 over phosphorus pentoxide yield 0.34 g (90%) m.p. 152°. Recrystallization from chloroform yields crystals containing 0.5 molecule of solvent. Similarly prepared was diphenyl methyl telluronium thiocyanate (m.p. 1250)2. 

Bis[diphenyl Methyl Tellnronium] Chromate6 Concentrated solutions of equivalent amounts of diphenyl methyl telluronium chloride and potassium chromate are mixed, the precipitate is collected, and recrystallized from water m.p. 151°. 

Triphenyl telluronium chloride or methyl diphenyl telluronium iodide dissolved in hot water precipitated the corresponding telluronium pseudohalide when mixed with an aqueous solution of an alkali metal or silver pseudohalide. 

Diphenyl Naphthyl Telluronium Iodide1 10 g (28 mmol) of diphenyl tellurium dichloridc are dissolved in 250 ml of dry toluene. A solution of 1 -naphthyl magnesium bromide in diethyl ether is prepared from 17.4 g (84 mmol) of 1-bromonaphthalene. The solution of the tellurium compound is quickly poured into the freshly prepared Grignard solution, the mixture is shaken vigorously, and 20 ml of dilute hydrochloric acid are added immediately. The solution is decanted from the precipitate, the precipitate is dissolved in boiling water, silver chloride is added, and the mixture is heated. The mixture is then filtered, sodium sulfite is added to the filtrate, and the telluronium iodide is precipitated by the addition of potassium iodide yield 11.8 g (78%) m.p. 148° (from ethanol, ethanol/diethyl ether). 

The cleavage of Te-C (phenyl) bonds was observed in reactions between diphenyl tellurium dichloride and 2-phenylethyl magnesium bromide in a diethyl ether/benzene medium at room temperature. Tris[2-phenylethyl telluronium bromide (m.p. 127°) and chloride (m.p. 135°) were isolated in approximately 40% yield4. 

---