Sodium acetate telluride

Sodium hydrogen telluride is prepared by reduction of tellurium with NaBH4 under several conditions. The original procedure uses ethanol as the solvent, adding, after complete reduction of the tellurium, an appropriate amount of acetic acid (see Section 4.1.2, ref. 10 Section 4.1.7, ref. 29). 

Sodium hydrogen telluride, 282 Tin(II) chloride, 298 By other methods Acetic-formic anhydride, 1 Arene(tricarbonyl)chromium complexes, 19... 

Isotellurazoles 4 were obtained in low yields (3-11%) by the one-pot reaction of alkynyl ketones with hydroxylamino-O-sulfonic acid and K2Te in aqueous solution containing sodium acetate (83S824 87H1587). A plausible mechanism of the reaction includes formation of the oxime derivative and subsequent nucleophilic addition of telluride anion to the triple bond followed by cyclization to 4. The reaction is accompanied by the formation of telluro bis(alkenyl ketones) 5 in yields approximately equal to those of 4. When alkynyl aldehydes are used instead of ketones, the single reaction products are the tellurobis(alkenyl nitriles) 6 (83S824). 

In an aqueous medium buffered by sodium acetate, acetylenic ketones react with potassium telluride to give bisfacylvinyl] telluriums. These reactions were performed in the presence of hydroxylamine-Osulfonic acid with the goal of preparing 2-azatellurophenes. The formation of divinyl tellurium compounds competes with the formation of the heterocycles6. 

Sodium hydrogen telluride, prepared from tellurium and sodium borohydride in ethanol/acetic acid, reacted with organyloxy-(/m.-butyl )-methylenedimethy1iminium chloride, obtained from A,A-2,2-tetramethylpropionamide and phosgene, to form organo... 

Tellurophene2 Sodium hydrogen telluride is prepared from 12.7 g (0.1 mol) tellurium and sodium in 150 ml dimethylformamide and the resulting solution cooled to 0°. A solution of 8.4 g (0.08 mol) of l-chloro-2-hydroxy-3-butyne in 20 ml ethanol is added dropwise during 30 min. The mixture is kept at 20° for 1 h and then treated with 5.6 g (0.1 mol) of powdered potassium hydroxide. The mixture is heated for 2 h at 100°, then cooled, treated with water, and extracted with diethyl ether. The extract is washed with water, dried, and concentrated. The residue is dissolved in a mixture of acetic acid/ethanol (1 8) (100 ml per 15 g) and the solution refluxed for 2 h. The mixture is then treated with water and extracted with diethyl ether. The extract is dried, filtered, and concentrated. The residue is distilled yield 10% b.p. 97/100 torr. 

Dimetbyl-l, 2-tellurazole1 1.7 g (15 mmol) of hydroxylamine O-sulfonic acid are dissolved in 5 ml of water, the solution is cooled to 0°, and 1.23 g (15 mmol) of methyl propynyl ketone are added to the vigorously stirred solution under nitrogen. The solution is stirred for 35 min and 2.5 g (30 mmol) of sodium acetate and 25 ml (l 5 mmol) of a 0.6 molar aqueous solution of potassium telluride are added to the solution over 20 min. The resultant solution is allowed to warm to 20 and is then stirred for 4 h. The reaction mixture is extracted 4 times with 20 ml portions of ethyl acetate and the extract is dried with anhydrous sodium sulfate, filtered, and evaporated to dryness. The residue is sublimed at 70°/0.001 torr and the sublimate recrystallized from acetone yield 0.3 mmol (10%) m.p. 111 . 

Tellurazoles were isolated in yields not exceeding 10% from reaction mixtures consisting of acetylenic ketones, hydroxylamine 0-sulfonic acid, sodium acetate, and potassium telluride ... 

On the other hand, the triflate 254 was treated with sodium azide, followed by reduction of the lactone carbonyl function, and subsequent mesylation, complete removal of the protecting groups and reprotection by EtsSiCl, to afford 259 (Scheme 25). Sodium hydrogen telluride reduction of the azide function in 259 followed by intramolecular double cyclization with sodium acetate afforded the bicycle 260, which on deprotection furnished 261 in 45% overall yield from the triflate 254. 

Hydroxyethyl)cyclopent-l-ene and benzenetellurinyl acetate formed an addition product containing a cyclie-ether functionality. This intermediate was reduced to the telluride, the telluride converted to the tellurium dibromide, and the dibromide heated in dimethylformamide with sodium bromide to give the brominated cyclic ether5. 

Cobalt Sesquitelluride is obtained in the hydrated form, Co2Te3.4H20, as a black precipitate when a solution of sodium telluride is added to one of cobalt acetate in dilute aqueous acetic acid.1 Hydrochloric and sulphuric acids are without action upon it, but nitric acid effects its oxidation. At 200° C. it loses water, and at red heat, tellurium if heated till no further loss in weight occurs, Cobalt Mono-telluride, CoTe, is obtained as a grey, crystalline substance of metallic lustre.2... 

Nickel Sesquitelluride, Ni2Te3, occurs in nature as the mineral melonite. It may be prepared by the addition of sodium telluride solution to one of nickel acetate acidulated with acetic acid.7 The resulting black precipitate has the composition Ni2Te3.4H20, and when heated in hydrogen yields Nickel Monotelluride, NiTe. 

Cupric telluride, CuTe.—The telluride is stated to be formed by the action of tellurium-powder on a solution of cupric acetate in presence of sulphur dioxide.18 It can also be precipitated from a solution of sodium telluride, Na2Te a sesquitelluride, Cu2Te3, is obtained similarly from the polytelluride Na4Te3 (p. 130).14 A telluride of the formula Cu4Te3 occurs as the mineral rickardite. 

Reducing agents Aluminum hydride. Bis-3-methyl-2-butylborane. n-Butyllithium-Pyridine. Calcium borohydride. Chloroiridic acid. Chromous acetate. Chromous chloride. Chromous sulfate. Copper chromite. Diborane. Diborane-Boron trifluoride. Diborane-Sodium borohydride. Diethyl phosphonate. Diimide. Diisobutylaluminum hydride. Dimethyl sulfide. Hexamethylphosphorous triamide. Iridium tetrachloride. Lead. Lithium alkyla-mines. Lithium aluminum hydride. Lithium aluminum hydride-Aluminum chloride. Lithium-Ammonia. Lithium diisobutylmethylaluminum hydride. Lithium-Diphenyl. Lithium ethylenediamine. Lithium-Hexamethylphosphoric triamide. Lithium hydride. Lithium triethoxyaluminum hydride. Lithium tri-/-butoxyaluminum hydride. Nickel-aluminum alloy. Pyridine-n-Butyllithium. Sodium amalgam. Sodium-Ammonia. Sodium borohydride. Sodium borohydride-BFs, see DDQ. Sodium dihydrobis-(2-methoxyethoxy) aluminate. Sodium hydrosulflte. Sodium telluride. Stannous chloride. Tin-HBr. Tri-n-butyltin hydride. Trimethyl phosphite, see Dinitrogen tetroxide. 

Related Reagents. Calcium Hydride Iron(III) Chloride-Sodium Hydride Lithium Aluminum Hydride Potassium Hydride Potassium Hydride-5-Butyllithium-(V,(V,(V, (V -Tetra-methylethylenediamine Potassium Hydride-Hexamethylphos-phoric Triatnide Sodium Borohydride Sodium Hydride-copper(II) Acetate-Sodium t-Pentoxide Sodium Hydride-nickel(II) Acetate-Sodium t-Pentoxide Sodium Hydride-palladium(II) Acetate-Sodium t-Pentoxide Tris(cyclopenta-dienyl)lanthanum-Sodium Hydride Lithium Hydride Sodium Telluride. 

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