Tellurium fluorides

Fluorotellurates containing -f-OTeFs)" groups are also known - see tellurium fluorides. ... 

Fluor-jod, n. iodine fluoride, -kalium, n. potassium fluoride, -kalzium, n. calcium fluoride, -kiesel, m. silicon fluoride, -kie-selsaure,/. fluosilicic acid, -kohlenstoff, m. carbon fluoride, -lithium, n. lithium fluoride. -metall, n. metallic fluoride, -natrium, n. sodium fluoride, -phosphat, n. fluophosphate. -phosphor, m. phosphorus fluoride, -salz, n. fluoride, -schwefel, m. sulfur fluoride, -selen, n. selenium fluoride, -silber, n. silver fluoride, -silikat, n. fluo-silicate. -silizium, n. silicon fluoride, -sili-ziumverbindung, /. fluosilicate. -tantal-sMure, /. fluotantalic acid, -tellur, n. tellurium fluoride, -titan, n. titanium fluoride, -toluol, n. fluorotoluene, fluotoluene. 

For comparative purposes and in order to enhance our understanding of trends in chemical shifts, typical examples of hypervalent selenium and tellurium fluorides are provided in Scheme 7.20. 

Chemistry of selenium and tellurium fluorides is well summarized in the literature.8,9 SeF2, FSeSeF, and Se = SeF2 have been prepared in minute... 

Two tellurium fluorides have been described, having the compositions TeF4 and TeF6, respectively. 

Heating of benzenesulfonimido 2,2,3,3-tetrafluoropropoxy tellurium fluoride and N-trimethylsilylmorpholine at 60° in benzene for 15 minutes gave rise to the moisture-sensitive benzenesulfonimino morpholino tetrafluoropropoxy telluriuml. 

Benzenesulfonimino Morpholino 2,2,3,3-Tetrafluoropropoxy Tellurium 1.5 g (3.55 mmol) of benzenesulfonimino tetrafluoropropoxy tellurium fluoride are suspended in 30 ml of anhydrous benzene, 0.48 g (3.0 mmol) of /V-trimcthylsilylmorpholine dissolved in benzene are added, and the mixture is heated at 60° for 15 min. The mixture is then filtered, the solvent is distilled from the filtrate under reduced pressure, and the wall of the flask is scratched to induce the oily residue to crystallize. The solids are combined yield 0.88 g (59%) m.p. 115° (dec.). 

Arenesulfonimino fluoroalkoxy tellurium fluorides are moisture-sensitive solids. 

When tris[fluoroalkoxy] tellurium fluorides were heated with arenesulfonamides at 11070.04 torr, fluoroalkanols were eliminated and arenesulfonimino fluoroalkoxy tellurium fluorides formed1. 

Benzenesulfonimino 2,2,3,3,4,4,5,5-Octafluoropentoxy Tellurium Fluoride1 4.0 g (5 mmol) of tris[octa-fluoropentoxy] tellurium fluoride are mixed with 0.79 g (5 mmol) of benzene-sulfonamide, and the mixture is heated at 110°/0.047 torr until the fluoroalkanol ceases to distill. The residue is recrystallized from benzene yield 2.3 g (88%) m.p. 202°. 

When fluoroalkoxy tellurium trifluorides and WjV-bisftrimethylsilylJarenesulfonamides were refluxed in benzene, fluorotrimethylsilane and arenesulfonimino fluoroalkoxy tellurium fluorides were formed. 

Similarly prepared were the following tellurium fluorides, benzenesulfonimino octafluoropentoxy... yield 93% m.p. 202°... 

When heated with W-trimethylsilylmorpholine in benzene at 60°, Benzenesulfonimino 2,2,3,3-tetrafluoropropoxy tellurium fluoride yielded benzenesulfonimino morpholino tetra-fluoropropoxy tellurium. ... 

Boiling water hydrolyzed arenesulfonimino fluoroalkoxy tellurium fluorides to tellurium dioxide, fluoroalkanols, arenesulfonamides, and hydrogen fluoride1. 

Tris[fluoroalkoxy] tellurium fluorides are thermally unstable, moisture-sensitive liquids. 

After tellurium tetrafluoride and fluoroalkoxytrimethylsilane (molar ratio 1 3) were refluxed in benzene for four hours, the corresponding tris[fluoroalkoxy] tellurium fluoride was isolated and purified by vacuum distillation2. 

Heating tris[fluoroalkoxy] tellurium fluorides with 4-methylbenzenesulfonamide at 11070.04 torr caused fluoroalkoxy (4-methylbenzenesulfonimido) tellurium fluorides to form1. 

Tnsffluoroalkoxy] tellurium fluorides were hydrolyzed by water at 60° to tellurium dioxide, fluoroalkanol, and hydrogen fluoride1. 

Fluorination of tetraalkoxy tellurium derivatives with a fluorine/nitrogen gas mixture in a medium of fluorotrichloromethane at —78° produced several alkoxy tellurium fluorides that could not be separated by distillation1.19F-NMR spectroscopy was used to identify the products and to determine their relative concentrations. 

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 trans-tetraalkoxy tellurium difluorides1. These mixtures could not be separated by distillation. The compounds were identified by 19F-NMR spectroscopy. 

When tetraalkoxy tellurium compounds were fluorinated in fluorotrichloromethane at — 78° with fluorine diluted by nitrogen, several alkoxy tellurium fluorides were formed, the identity of which were established by 19F-NMR spectroscopy1. The reactions were carried out as described on page 123. 

Hexamethoxy tellurium dissolved readily in anhydrous hydrogen fluoride. After heating the mixture at 60° for 24 hours, the reaction appeared to have been complete. All possible methoxy tellurium fluorides, among ihem jac-trimethoxy tellurium trifluoride, were present in the mixture. The components of the mixture were not separated but identified by 10F-NMR spectroscopy2. 

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