From Tellurium Hexafluoride

Tellurium hexafluoride heated with at least 4.5 molar equivalents of a primary alcohol at 90° for 9 days in the presence of excess sodium fluoride, formed a mixture of alkoxy tellurium fluorides containing cis- and tetraalkoxy tellurium difluorides. These mixtures could not be separated by distillation. The compounds were identified by F-NMR spectroscopy. 

Tetraalkoxy Tellurium Difluorides The required amount (0.16 mol) of alkanol and 90 g (2.1 mol) of dry sodium fluoride are placed in a 600-ml reaction tube. The tube is cooled in liquid nitrogen, evacuated to 0.001 torr, and 8.6 g (35.6 mmol) of tellurium hexafluoride are condensed into the tube, which is then sealed. The tube is allowed to warm to 20°, then heated at 90° for 9 days, cooled, and opened. The mixture is extracted with chloroform, the extract is evaporated, and the residue is distilled under vacuum. 

Irgolic Organo-tellurium Compounds without a C,Te-Bond 

2-Trifluoroethanol had not formed any tetraalkoxy tellurium difluoride after 9 days. After 28 days the mixture contained 29% of this compound. In reactions with prop-2-en-l-ol, decomposition occurred after five days. The reaction between tellurium hexafluoride and M-propanol produced no tetrapropoxy tellurium difluoride.  

Tellurium hexafluoride and an excess of 1,2-dihydroxyethane reacted in the presence of pyridine at 20° to form a mixture of the cis- and traM -isomers of 5,5-difluoro-],4,6,9-tetraoxa-5-telluraspiro[4.4]nonane. The monocyclic tellurium tetrafluoride is an intermediate in this reaction.  

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