From Diorganotetrahalotellurates VI via Halogen Exchange

Solutions of diorganotetrachlorotellurates(IV) or diorganodihalodiiodotellurates(IV) in 4 M aqueous hydrochloric acid were treated with an aqueous solution of excess potassium iodide where upon the tetraiodotellurates(TV) precipitated. 

Irgolic Organo Tellurium Compounds with 2 Te —C Bonds or 1 Te = C Bond 

Bi [tetraphenylarsoniuiii] Tetramethylenetetraiodotellurate(IV) 1.27 g (1 mmol) of bis[tetraphenylarso-nium] tetramethylenedichlorodiiodotellurate(IV) are dissolved in 4 molar aqueous hydrochloric acid, the solution is stirred, and an excess of potassium iodide dissolved in water is added. The precipitated product is washed with water and dried yield 1.46 g (100%) m.p. 210°. 

Bis[tetrahexylammonium] tetramethylenetetrafluorotellurate(IV) was prepared by treating the tetraiodo compound with an aqueous suspension of silver oxide. The resulting solution was neutralized with hydrofluoric acid.  

Bis[tetrahexylammonium] TetramethylenetetrafluoroteUurate(lV) 1.39 g (1 mmol) of bis[tetrahexylam-monium] tetramethylenetetraiodotellurate(rV) are ground with 0.46 g (2 mmol) of freshly prepared silver oxide in the minimum quantity of water and the mixture is filtered. The filtrate is plaeed in a platinum crucible and hydrofluoric acid is added until the solution is neutral. The solution is evaporated over concentrated sulfuric acid under vacuum and the residue is recrystaUized from aeetone yield 0.91 g (100%) m.p. 235°. 

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