Tellurium Cyanate Iodide

Diaryl tellurium iodide cyanates and thiocyanates have been prepared. They arc colored, crystalline solids with sharp melting points, soluble in organic solvents and stable at 20 ... 

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. 

Diaryl telluriums combined with iodine azide or iodine cyanate in carbon tetrachloride at — 10° to give diaryl tellurium iodide pseudohalides3. 

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. 

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