Diphenyl silver cyanate

Diphenyl Tellurium Cyanate Iodide1 0.89 g (2 mmol) of diphenyl tellurium chloride iodide and 0.30 g (2 mmol) of silver cyanate in 30 ml of chloroform are stirred at 20°. The precipitated silver chloride is filtered and the filtrate is concentrated to give yellow needles of the product yield 95% m.p. 80°. 

Diphenyl tellurium azide iodide and diphenyl tellurium cyanate iodide reacted with silver thiocyanate in chloroform with exchange of iodide for thiocyanate4. 

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. 

Diphenyl tellurium iodide cyanate slowly decomposes even at low temperature1. Surprisingly, when diaryl tellurium chloride iodides were stirred with equimolar amounts of silver pseudohalides in chloroform, silver chloride was surprisingly precipitated instead of the more insoluble silver iodide. The diaryl tellurium iodide pseudohalides were isolated in almost quantitative yields12. 

Triphenylbismuthine dichloride, ( 6115)361012/ occurs when chlorine is passed into a solution of triphenylbismuthine m ether, petroleum ether, chloroform or carbon tetrachloride. It crystallises in stout needles, M.pt. 126° C., soluble in alcohol, chloroform or benzene, practically insoluble in ether or petroleum ether. Moist silver oxide, alcoholic potassium hydroxide, potassium cyanate and other inorganic salts react with the dichloride giving varying yields of triphenyl-bismuthme. When a chloroform solution of the dichloride is treated with moist ammonia, one chlorine atom is removed and triphenylbismuthine hydroxychloride results. When the dichloride is added to concentrated sulphuric acid it yields triphenylbismuthine sulphate and hydrogen chloride is evolved. A dry benzene solution of the dichloride when boiled undergoes partial decomposition with formation of diphenyl-chlorobismuthinc. 

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