To Tetraorgano Tellurium Compounds

The reaction of diphenyl tellurium dichloride with phenyl lithium yielded tetraphenyl tellurium -. Bis[trifluoromethyl] tellurium dichloride and bis[trifluoromethyl] cadmium reacted to produce tetrakis[trifluoromethyl tellurium.  

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The diorgano tellurium dicarboxylates are white, crystalline materials that are soluble in organic solvents and stable towards atmospheric agents. Diaryl tellurium diacetates can be boiled in water without decomposition. However, bis[trifluoromethyl] tellurium bis trifluoroacetate] was reported to be moisture-sensitive. Aqueous sodium hydroxide converts diaryl tellurium dicarboxylates to diaryl tellurium oxides or dihydroxides . Thermal gravimetric analysis of diaryl tellurium dicarboxylates indicated that these compounds lose carbon dioxide at 240-260° and form the tetraaryl tellurium derivatives. The tetraorgano tellurium compounds decompose slowly to the diaryl tellurium compounds and hydrocarbons. ... 

Triorgano telluronium halides reacted with organic lithium compounds to form tetraorgano tellurium compounds . ... 

Tetraorgano tellurium compounds are thermally decomposed to diorgano tellurium compounds and hydrocarbons . Whereas tetramethyl tellurium, tetrabutyl tellurium, and diaryl dialkyl tellurium compounds already form diorgano tellurium compounds by loss of alkyl groups at or below 20° tetraphenyl tellurium tetrakis[pentafluoro-phenyl] telluriumtetrakis[4-methylphenyl] tellurium , and bis[2,2 -biphenyldiyl] tellurium must be heated to at least 100° to effect decomposition. 

Triorgano telluronium halides reacted with organo lithium compounds to produce tetraorgano telluriums . 

Because a number of these organometallic compounds are commercially available, they are convenient starting materials for the preparation of certain aliphatic and aromatic diorgano tellurium dihalides. Tetraorgano tin and lead compounds transfer only two of their four organic groups to tellurium. Experiments with dialkyl-diaryl compounds showed that only the aryl groups are transferred. 

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