Bis 2,2,3,3-tetrafluoropropoxy

Bis[morphohno] lellurium Dichloridc3 To a stirred solution of 1.38 g (3 mmol) of bis[2,2,3,3-tetrafluoropropoxy] tellurium dichloride in 20 ml of anhydrous diethyl ether at 0° is added dropwise a solution of 1.03 g (6.5 mmol) of JV-trimethylsilylmorpholine in 10 ml of diethyl ether. The mixture is stirred at 5° for 1 h. The precipitate is filtered and washed with diethyl ether yield 80%. 

Benzenesulfonimino Bis[2,2,3,3-tetrafluoropropoxy] Teliurium1 3.3 g(5 mmol)oftetrakis[2,2,3,3-tetrafluoro-propoxy] tellurium are mixed with 0.79 g (5 mmol) of benzenesulfonamide, and the mixture is heated at 110o/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.). 

Refluxing of equimolar amounts of bis[2,2,3,3-tetrafluoropropoxy] tellurium difluoride and Af,Af-bis[trimethylsilyl]benzenesulfonamide in benzene yielded benzenesulfonimino bis[tetrafluoropropoxy] tellurium1. 

Benzenesulfonimino Tellurium Difluoride2 A mixture of 12.8 g (30 mmol) of bis[2,2,3,3-tetrafluoropropoxy] tellurium difluoride and 4.7 g (30 mmol) of benzenesulfonamide is heated at 63°/0.035 torr for 40 min and at 95o/0.035 torr for 1 h. After all the alcohol has distilled off, benzene is added to the mixture, the deposited solid is filtered off, washed several times with small portions of hot benzene, and dried. The product should be stored with protection from moisture yield 9.4 g (98%) m.p. 237-240°. 

Bis[2,2,3,3-tetrafluoropropoxy] tellurium oxide was also obtained when the acetyl tellurium tris[fluoroalkoxide] was kept at 80° under 0.01 torr1. 

Bis[2,2,3,3-tetrafluoropropoxy] Tellurium Difluorideh 6.1 g (30 mmol) of tellurium tetrafluoride are suspended in 50 ml of anhydrous benzene, 12.2 g (60 mmol) of 2,2,3,3-tetrafluoro-l-trimethylsiloxypropane are added dropwise with stirring, the mixture is heated at 70° for 2 h, and filtered. Fluorotrimethylsilane and benzene are distilled from the filtrate and the residue is distilled under vacuum yield 11.1 g (87%) b.p. 95°/0.03 torr. 

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