Telluronium Tetraphenylborate

Triphenyl telluronium tetraphenylborate (dec. > 200") was similarly obtained in 50% yield1. 

Similarly prepared were the following telluronium tetraphenylborates-. 

Trimethyl telluronium tetraphenylborate was prepared by mixing DMF solutions of the reactants. The product was precipitated by addition of water to the reaction mixture2. 

The following heterocyclic telluronium tetraphenylborates were prepared in refluxing ethanol3-5. 

Dimethyl tellurium dichloride, diphenyl tellurium dichloride and heterocyclic tellurium diiodides reacted with sodium tetraphenylborate in methanol or ethanol to produce telluronium tetraphenylborates. ... 

Tellurolane-l,l-diiodide, 2-methyltellurolane-l,l-diiodide, l,4-oxatellurinane-l,l-diiod-ide", or 1,3-dihydrobenzo[c]tellurole and sodium tetraphenylhorate had to be refluxed for 2h to obtain telluronium tetraphenylborates. ... 

Triphenyl Telluronium Tetraphenylborate Equimolar amounts of aqueous solutions of triphenyl telluronium chloride and sodium tetraphenylborate are mixed. The voluminous precipitate is filtered off, washed with water, and recrystallized from dimethylformamide/water m.p. 219". 

Dimethyl Phenyl Telluronium Tetraphenylborate1 0.46 g (2 mmol) of dimethyl telluronium dichloride are dissolved in 30 ml of absolute methanol and a solution of 1.7 g (5 mmol) of sodium tetraphenylborate in 30 ml of methanol is added dropwise with stirring at 20°. Stirring is continued for 2 h, the mixture is filtered, and the solid is recrystallized from ethyl methyl ketone yield 0,81 g (65%) decomposes above 200°. 

Tellurolane-1,1 -diiodide2, 2-methyltellurolane-l, 1-diiodide3,1,4-oxatellurinane-l, 1-diiodide4, or 1,3-dihydrobcnzo[c]tellurole and sodium tetraphenylborate had to be refluxed for 2 h to obtain telluronium tetraphenylborates5. 

TOphenyl Telluronium Tetralluoroborate 0.27 g (1 mol) of tellurium tetrachloride and 1.37 g (4 mmol) of sodium tetraphenylborate are added to 60 ml of benzene, the mixture is shaken vigorously for at least 24 h, then filtered, and the solid washed with water. The solid is extracted with acetone and water is added to the extract to precipitate the product yield 0.34 g (50%) m.p. > 200° (dec.). 

Dimethyl and methyl phenyl 4,4-dimethyl-2,6-dioxocyclohexylidene tellurium compounds transferred a methyl group to triethylamine, triphenylphosphane, tris[di-methylamino]phosphane, and triphenylarsane. The methyl onium cations were isolated as tetraphenylborates. The alkylidene organo telluronium intermediate was identified by P-NMR spectroscopy in the reaction of the ylide with tris[dimethylamino]phosphanek... 

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