Tellurium Hydroxide

Triphenyl tellurium hydroxide may be isolated from the iodide by boiling with silver oxide and water. It is an alkaline resin, yielding a picrate, consisting of broad yellow needles, M.pt. 160° C.2... 

Cyclohexyl phenyl tellurium reacted with 3-chloroperoxybenzoic acid to form cyclohexyl phenyl tellurium hydroxide benzoate that decomposed at 250° to give cyclohexene (19% yield)1. A similar sequence of reactions starting with phenyl 1-tetradecyl tellurium produced 1-tetradeccne (42%), 1-tetradecanol (7%), and 1-tetradecanal (2%). ... 

Alkyl and cycloalkyl halides react with benzenetellurolate to yield (cyclo)alkyl phenyl telluriums, which are converted to (cyclo)alkyl phenyl tellurium dibromides upon treatment with bromine. Stirring of a mixture of these tellurium dibromides and 0.5 M aqueous sodium hydroxide at 20° resulted in the formation of (cyclo)alkenes5. Alkyl phenyl tellurium oxides were postulated as intermediates that eliminated phenyl tellurium hydroxide. 

Diorgano tellurium hydroxide halides with chloride1 4 bromide3,5"6, or iodide4,6> 7 as the halogen are known. 

Short chain dialkyl tellurium dichlorides are hydrolyzed to dialkyl tellurium hydroxide chlorides by the action of cold water7, whereas diaryl tellurium dihalides will react only when refluxed in water1,3 or water-containing organic solvents8. Aqueous ammonia was employed to prepare dialkyl tellurium hydroxide halides4,5. 

From Diaryl Tellurium Hydroxide Halides and Potassium Iodide... 

Because diaryl tellurium diiodides are not hydrolyzed by boiling water, the diaryl tellurium hydroxide iodides were prepared by treating the hydroxide chlorides or bromides with potassium iodide1. 

Diphenyl Tellurium Hydroxide Iodide1 Diphenyl tellurium chloride (or bromide) hydroxide is dissolved in water and a slight excess of potassium iodide dissolved in water is added. The yellow precipitate is filtered off and recrystallizcd from methanol. For dissolution of the product in methanol, the mixture is heated cautiously on a water bath to prevent the hydroxide iodide from disproportionating to the diiodide and the dihydroxide (or oxide). The pure product has m.p. 215°... 

Similarly prepared was bis[4-methylphenyl] tellurium hydroxide iodidem.p. 204°... 

Bis[2-methylphenyl] tellurium hydroxide iodide decomposed to the diiodide and the oxide during attempts at recrystallization from methanol1. 

According to conductivity measurements, the aqueous ethanolic solutions obtained by mixing equimolar amounts of dialkyl tellurium dihalides and dihydroxides contain dialkyl tellurium hydroxide halides2,3. 

Bisfdiorgano tellurium halide] oxides are the anhydrides of diorgano tellurium hydroxide halides. Aryl derivatives can be obtained by heating diaryl tellurium halide hydroxides to 150-180°3... 

Whether hydrolytic reactions of diorgano tellurium halides produce diorgano tellurium hydroxide halides or their anhydrides might be governed by the solubility of the anhydride, which is influenced by the halide. Treatment of the solutions obtained by boiling mixtures of diaryl tellurium dichlorides and water or treatment of aqueous solutions of diaryl tellurium hydroxide chlorides with potassium bromide1 or potassium iodide1 3 formed bis[diaryl tellurium halide] oxides. 

Bis[4-methylphenyl Phenyl Tellurium Bromide] Oxide1 1.5 g (4.3 mmol) of 4-methylphenyl phenyl tellurium hydroxide chloride (or dichloridc) are dissolved in water and potassium bromide is added. The precipitate is collected and recrystallized from 600 ml of water m.p. 260°. 

Dialkyl tellurium hydroxide carboxylates were formed from dialkyl tellurium hydroxide chlorides and metal carboxylates1 7... 

Bis[4-methoxyphenyl] tellurium oxide reacted with an equimolar amount of trichloroacetic acid in benzene to produce bis[4-methoxyphenyl tellurium hydroxide trichloroacetate. ... 

Bis[4-methoxyphenyl] Tellurium Hydroxide Trichloroacetate1 3.58 g (1.0 mmol) of bis[4-methoxyphenyl] tellurium oxide is suspended in 30 ml of dry benzene and a solution of 1.65 g (1.0 mmol) of trichloroacetic acid in 10 ml of dry benzene is added dropwise to the stirred suspension over i 0 min. The mixture is stirred for 14 min at 20°. filtered, and the filtrate evaporated. The oily residue is triturated with petroleum ether and the resultant solid is rccrystallized from carbon tetrachloride yield 4.85 g (95%) m.p. 116-119°. 

Bis[4-methylphenyl] tellurium hydroxide carboxylates were obtained when the diaryl tellurium dichloride was reacted with silver caprate or silver caproate in dioxane. It is likely that the diaryl tellurium dicarboxylates, the expected products of these reactions, were hydrolyzed during the reaction or on recrystallization2. 

Alkyl phenyl tellurium hydroxide 3-chlorobenzoates were obtained from alkyl phenyl telluriums and 3-chloroperoxybenzoie acid3. 

Diethyl tellurium hydroxide hydrogen carbonate was formed when the corresponding chloride hydroxide was treated with silver carbonate4. 

Diaryl tellurium hydroxide perchlorates were obtained from equimolar amounts of diaryl tellurium oxides and perchloric acid1. 

Similarly obtained was diphenyl tellurium hydroxide perchlorate (m.p. 253°) in 64% yield1. 

Diaryl tellurium hydroxide bromocamphorsulfonates were prepared by hydrolysis of the diaryl tellurium disulfonates with cold water2,3. 

A few diorgano tellurium hydroxide (hydrogen) sulfates are reported in the older literature. Diethyl tellurium hydroxide sulfates were claimed to have been produced from the hydroxide chloride and silver sulfate1 and from the dihydroxide and sulfuric acid2. Several ill-defined compounds that could be or could contain hydroxide hydrogen sulfates were obtained when dibenzo-l,4-oxatellurin or its 10,10-diacetate were treated with sulfuric acid3. 

Aqueous nitric acid, varying in concentration from dilute to concentrated, oxidized diorgano tellurium compounds to diorgano tellurium hydroxide nitrates3 5. Some of these compounds are reported to explode when heated above their melting points3,4,s. 

Butyl J-Menthoxycarbonylmethyl Tellurium Hydroxide Nitrate4 5g (13 mmol) of butyl /-menthoxycarbonylmethyl tellurium is mixed with 10 ml of 6 molar (or 100 ml of 0.6 molar) (60 mmol) of nitric acid. The product separates as a glassy solid which is collected, washed with water, and dried under vacuum yield 6 g (100%) m.p. 42°. 

Boiling diaryl tellurium dinitrates in water is reported to give diaryl tellurium hydroxide nitrates4. 

Dimethyl tellurium hydroxide (dihydrogen phosphate) was claimed as the product of the reaction between dimethyl tellurium dihydroxide and phosphoric acid7. 

Treatment of the solutions obtained by boiling mixtures of diaryl tellurium dichlorides and water or treatment of aqueous solutions of diaryl tellurium hydroxide chlorides with sodium thiocyanate gave rise to bis[diorgano thiocyanato tellurium] oxides1. 

Some diaryl tellurium dinitrates did not give diaryl tellurium hydroxide nitrates on treatment with water but deposited the corresponding anhydride2,3 ... 

Diorgano tellurium oxides react with nitric and perchloric add producing diorgano tellurium hydroxide perchlorates1, diperchlorates2, hydroxide nitrates3, or dinitrates4. 

---