Tellurium tetrabromide tetrachloride

See Tellurium tetrabromide Ammonia Tellurium tetrachloride Ammonia... 

Silver difluoride, 0014 Silver fluoride, 0013 Sodium chloride, 4036 Sodium iodide, 4623 Tantalum pentachloride, 4185 Tellurium tetrabromide, 0296 Thallium, 4922 Tin(II) chloride, 4116 Tin(IV) chloride, 4174 Tin(II) fluoride, 4331 Titanium(II) chloride, 4117 Titanium dibromide, 0284 Titanium diiodide, 4630 Titanium tetrachloride, 4176 Titanium tetraiodide, 4638 Titanium trichloride, 4158... 

Tellurium tetrachloride (as well as tellurium tetrabromide and tellurium tetraiodide) reacts with 4 mol equiv of arylmagnesium bromide, giving rise to diaryl teUurides in high yields. ... 

With chlorine and bromine, products are tellurium tetrachloride, TeCL, a white, very hygroscopic crystalline solid, and tellurium tetrabromide, TeBr4, an orange crystalline solid ... 

Tellurium Dibromide, TeBr2.—Just as the tetrachloride can be reduced to the dichloride, so can tellurium tetrabromide be made to yield the dibromide by treatment in dry ether solution in the dark with finely divided tellurium. The solution so obtained is chocolate-brown in colour and is decomposed by water 8... 

Tellurium tetrachloride and tellurium tetrabromide reacted with four molar equivalents of dithiocarboxylic acids or their piperidinium salts. Tellurium bis[dithiocarboxylates] were formed1. However, the reaction between tellurapentathionate and dithiocarboxylates is the preferred method for the preparation of tellurium bis[dithiocarboxylates] ... 

Tellurium tetrachloride and tellurium tetrabromide were converted to tellurium dithiocarboxylate halides in reactions with two or fewer molar equivalents of dithiocarboxylic acids1,2 or their piperidinium salts1. Reactions with a 3 1 molar ratio of the reagents (dithiocarboxylate/tellurium tetrahalide) were not carried out. 

Solutions of sodium fluoroalkoxides in diethyl ether reacted with suspensions of tellurium tetrachloride or tellurium tetrabromide in ethanol at room temperature to produce the... 

The compound decomposed on storage with deposition of tellurium1. Tellurium tetrachloride need not be used in substance it can be generated in the reaction mixture from tellurium dioxide and acetyl chloride or chlorotrimethylsilanc. With acetyl bromid tellurium tetrabromide can be formed. When cyclohexene was present in the reaction mixture, 2-halocyclohexyl tellurium trihalides were isolated in approximately 70% yields. Acetic acid, chloroform, or dichloromethane may be used as solvents2. 

When the addition reactions of tellurium tetrachloride or tellurium tetrabromide were carried out in the presence of an alcohol with a cycloalkene as the olefin, trans-2-alkoxycycloalkyl tellurium trihalides were isolated in yields ranging from 30 to 80%4... 

Tellurium tetrabromide, generally less reactive than tellurium tetrachloride, is reported not to combine with ethylene6. However, tellurium tetrabromide reacted with norbornadi-... 

Tellurium tetrachloride and tellurium tetrabromide added to 1,5-diolefins and 1,6-diolefins with formation of heterocyclic tellurium compounds3-5. 

Dimethyl ditellurium is formed when methyl radicals, generated by thermal decomposition of methane butane, diethyl ether, or dimethyl ether interact with tellurium mirrors. Because dimethyl ditellurium can be prepared more conveniently by other methods, these reactions are not of synthetic importance. However, this reaction is one of the two ways to prepare bis[trifluoromethyl] ditellurium. Thus, this compound was prepared through interaction of trifluoromethyl radicals with tellurium tetrachloride , tellurium tetrabromide " or tellurium "... 

Methyl groups in nitromethane and dimethyl sulfite are sufficiently activated to condense with tellurium tetrachloride and tellurium tetrabromide to give organo tellurium trihalides. For condensation reactions with carboxylic acid anhydrides see Vol. IX, p. 1152. 

If A -propargylcarbazole (201) is reacted with tellurium tetrachloride cyclization occurs to afford the tetracycle (203). The annulation process is interesting since cyclization and dehalogenation of the presumed intermediate (202) occur concomitantly (Equation (47)). An analogous reaction occurs if tellurium tetrabromide is the reagent <90KGS126>. 

Tellurium dioxide complexes with thiourea, 305 Tellurium dithiocyanate complexes, 303 Tellurium hexafluoride complexes, 303 with amines, 304 Tellurium sulfate complexes, 303 Tellurium tetrabromide complexes, 302 Tellurium tetrachloride complexes with acetamide, 304 with amines, 304 with pyridine N-oxide, 304 Tellurium tetrafluoride complexes with amines, 304 with dioxane, 304 Tellurotungstates, 1042 Tempera ture-jump studies molybdenum(VI) complexes, 1259 Terbium complexes p diketones, 1081... 

Additional method preparation of organyltellurium trichlorides and tribromides by the reaction of tetraorganyltin compounds with tellurium tetrachloride and tetrabromide ... 

Stable representatives of telluroketones were not available until recently. 2,5-Dihydro-1,3,4-telluradiazole 172 can be prepared from hydrazones 171 and tellurium tetrachloride or tetrabromide in yields of 19-48 and 42-55%, respectively (Scheme 8.39) (237). Ketazines 173 were obtained as byproducts of this reaction in 32 5% yield. It was proposed that XeX4 is hrst reduced to TeX2 in the reaction medium. The latter species probably generates both the diazo compound and the telluroketone derived from hydrazone 3 and then a [3+2] cycloaddition occurs. In fact, both 172 and 173 were obtained when hydrazones 3a-c were treated with the difhcult-to-handle tellurium dichloride in the presence of triethylamine. 

Tellurium tetrachloride or tetrabromide reacted with three molar equivalents of potassium 0-ethyl dithiocarbonale to form tellurium (0-ethyl dithiocarbonate) halides1,2. 

Tellurium tetrachloride and tetrabromide react with equimolar quantities of aryl mercury chlorides to produce aryl tellurium trihalides in high yields. This reaction is useful when the trichlorotelluro group is required at a specific position in the aromatic molecule or when tellurium tetrachloride does not condense in an acceptable manner with the aromatic hydrocarbon. The solvent of choice is dioxane, because mercury dichloride precipitates as the dioxane adduct, facilitating the isolation and purification of the aryl tellurium trichlorides. 

The following (l-oxa-3-azoniacyclopent-2-en-5-yl-methyl tetrahalolellurates(IV) were obtained from the appropriate acyldialkylamine and tellurium tetrachloride or tetrabromide, when the reaclion mixture was kept at 40° 2. 

Carbon ditelluride has not yet been prepared. Attempts to prepare this compound from carbon tetrachloride and hydrogen telluride, carbon tetrabromide or tetraiodide and silver telluride, carbon and tellurium2, or dichloromethane and tellurium3 were unsuccessful. The claim of the preparation of carbon ditelluride by sputtering tellurium from a tellurium/graphite electrode in a DC-arc under carbon disulfide4 was withdrawn5. 

Organic compounds of mercury, tin, and lead do not suffer from these shortcomings and convert tellurium tetrachloride and tetrabromide to diorgano tellurium dihalides in excellent yields. 

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