Tetrakis 2,2,3,3-tetrafluoropropoxy

Addition of arenethiols to ethanolic solutions of tetrakis[2,2,3,3-tetrafluoropropoxy] tellurium at — 50° precipitated quantitatively a mixture of bis[arylthio] tellurium compounds and diaryl disulfanes. Recrystallization from petroleum ether separated the two products2. 

Bis[4-Chlorophenylthio] Tellurium2 3.6 g (25 mmol) of 4-chlorobenzenethiol are dissolved in 25 ml of anhydrous ethanol, the solution is cooled to — 50°, and 3.25 g (5 mmol) of tetrakis[2,2,3,3-tetrafluoropropoxy] tellurium are added dropwise. The mixture is stirred for 10 min, filtered, the solid is washed with chilled (—20°) diethyl ether, dried under reduced pressure at <0°, and recrystallized from petroleum ether at low temperature yield 2.07g (100%), m.p. 105-107°. 

Dipiperidino Tellurium Bis(2,2,3,3-tetrafluoropropoxide)2 To a stirred solution of 1.17 g (3 mmol) of tetrakis[2,2,3,3-tetrafluoropropoxy] tellurium in 20 ml of anhydrous diethyl ether that is cooled with ice/water is dropped a solution of 0.93 g (6.5 mmol) of /V-lrimethylsilylpi peri dine in 10 ml of anhydrous diethyl ether. The mixture is stirred at 5° for 1 h. The precipitated compound is filtered and washed with anhydrous diethyl ether yield 89% m.p. 65-67°. 

When benzenesulfonimino bis[tetrafluoropropoxy] tellurium and two molar equivalents of tetrafluoropropanol were refluxed in benzene for 3 h, tetrakis tetrafiuoropropoxy] tellurium was formed1. 

Benzenesulfonimino Bis[2,2,3,3-tetrafluoropropoxy] Tellurium 3.3 g (5 mmol) of tetrakis[2,2,3,3-tetrafluoro-propoxy] tellurium are mixed with 0.79 g (5 mmol) of benzenesulfonamide, and the mixture is heated at 110°/0.04 torr until the fluoroalkatiol ceases to condense in a trap cooled at — 25 The mixture is triturated with petroleum ether/diethyl ether (4/1, v/v), filtered, the solid is washed with diethyl ether cooled to - 10 , and dried under anhydrous conditions yield 1.8 g (66%) m.p. 198° (dec.). 

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