Tellurides preparation

In contrast, tellurium insertion in alkyl- or aryllithium compounds followed by alkylation is a useful method for the synthesis of unsymmetrical tellurides. (For a tabulation of unsymmetrical tellurides prepared by alkylation of organyl tellurolates, see ref. 8.)... 

Treatment of vinylic tellurides prepared by photopromoted carbotelluration of terminal acetylenes (see Section 3.16.3) with aqueous NaOCl, followed by pyrolysis, affords internal acetylenes in good yields. ... 

Epoxides bearing a leaving group in a suitable position, such as chloromethyl epoxides, react with sodium telluride (prepared by the Rongalite method), giving allyhc alcohols. ... 

Typical procedure Phenylcinnamyl telluride (prepared from sodium phenyl tellurolate, 1 mmol, and cinnamyl bromide, 1 mmol in EtOH, 10 mL) was treated with Phl=NTS (1.5 mmol) and the mixture was stirred at 25°C for 20 h. After removal of the solvent, the product was purified by column chromatography on Si02 (eluent hexane/AcOEt). 

Transmetallations of vinylic tellurides deserve particular attention. These tellurides (prepared by anti-addition of tellurols to acetylenes, see Section 3.16.1.2) exhibit the Z configuration and therefore generate (Z)-vinyUithiums. These results are in sharp contrast to the earlier tin-lithium exchange performed with vinylstannanes (characterized by the E configuration), giving (ii)-vinyllithiums. ... 

Bis(trispyrazolylborate)titanium(II) complexes, preparation and reactivity, 4, 266 Bis-vinylic tellurides, preparation, 9, 605 Bis( -xylene)lead(II)bis(tetrachloroaluminate), preparation,... 

Allylic phenyl tellurides, prepared in situ from the corresponding halides and diphenyl ditelluride, were converted by Phi = NTs, through a [2,3] sigmatropic rearrangement of ylidic intermediates, into A-tosylated allylic amines, e.g. [49] ... 

Sodium telluride prepared in situ from tellurium and NaH in TV-methyl-2-pyrrolidone reacts with iodoarenes to give diaryl tellurides302. 

Bis methylgermyl] Tellurium5 0.36 g (1.62 mmol) of bis[methylgermyl]carbodiimide are condensed into a 150 m/, greaseless vessel. The vessel is cooled to — 196°, excess hydrogen telluride, prepared by acidic hydrolysis of aluminum telluride, is condensed into the vessel, and the mixture is carefully warmed to 20° (the mixture is cooled if the reaction becomes too vigorous). After 1 h the reaction mixture is fractionated under reduced pressure using cold traps to collect the product yield 0.31 g (62%). 

Dilithium telluride, prepared from lithium and tellurium in liquid ammonia2 4 or from tellurium and lithium triethylborohydride5, reacted with alkylhalosilanes and -germanes to yield disilyl and digermyl tellurium derivatives. 

Sodium hydrogen telluride, prepared from tellurium and sodium borohydride in aqueous or aqueous/ethanolic medium, reacted with 1,4-diiodooctaphenyltetragermane3, chlorotri-phenylstannane4, 1,2-dichlorotetramethyldistannane5, dichlorodimethylstannane6, and with chlorotriphenylgermane7. 

Disodium telluride, prepared from tellurium pieces, sodium, and naphthalene in tetra-hydrofuran, reacted with allyl bromide to give diallyl telluriuml. 

When organic dihalides with five atoms between the two halogen atoms were reacted with disodium telluride, prepared by the Rongalite method, the corresponding telluranes were formed2-6. 

Hydrogen telluride, prepared from aluminum telluride and 2 molar hydrochloric acid, added to the double bond in vinyl cyanide and formed bis[2-cyanoethyl tellurium1. 

Sodium telluride, prepared from the elements in liquid ammonia, reacted with 2-chlorobenzoyl chloride in hexane and with 1-naphthoyl chloride in toluene in the dark to yield diaroyl telluriums4,5. 

Sodium telluride, prepared from tellurium and sodium borohydride in water, condensed with phthaloyl chloride in toluene in the presence of a phase-transfer agent to produce 1,3-dioxo-1,3-dihydro-2-benzotellurophene6. 

Lithium telluride, prepared from tellurium and lithium triethylborohydride in tetrahydrofuran2, and sodium telluride, obtained from sodium and tellurium in a dipolar, aprotic solvent or from tellurium2,5 and Rongalite in aqueous sodium hydroxide2, reacted with aliphatic2,3,6 and aromatic5 dihalides to produce polymeric organo tellurium compounds. 

When sodium telluride, prepared from tellurium and sodium formaldehydesulfoxy late, was used in these reactions, acetylenic allyl alcohols were isolated as the major products. ... 

Sodium telluride, prepared from tellurium and sodium formaldehydesulfoxylate in aqueous sodium hydroxide, reacted with the diazonium salt that was obtained from bis[2-aminophenyl] ketone to produce... 

Disodium telluride, prepared from tellurium and sodium borohydride, and 2-chloro-3-(2-chloroethyl)quinoline formed 2,3-dihydroquinolo[3,2-tf]tellurophene. ... 

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