With Elemental Halogens

Diorgano tellurium compounds are easily oxidized by elemental halogens to diorgano tellurium dihalides. Generally, the reactions arc carried out with solutions of the reagents in inert organic solvents such as diethyl ether, methanol, acetonitrile, dichloromethane, chloroform, carbon tetrachloride, fluorotrichloromethane, benzene, or toluene. Often, the diorgano tellurium dihalides precipitate quantitatively from the reaction mixture. Soluble products are isolated by evaporation of the solvent or by addition of petroleum ether or hexane. 

Fluorination of diorgano telluriums with elemental fluorine generally requires low temperatures and fluorine/argon or fluorine/nitrogen mixtures Diphenyl tellurium was successfully fluorinated at 20° f 

Irgolic Organo Tellurium Compounds with 2 Te —C Bonds or 1 Te = C Bond 

These reactions can be carried out in glass vessels. The glass will become only slightly frosted. Bis[trifluoromethyl] tellurium difluoride was also obtained using chlorine fluoride, bromine trifluoride, or xenon difluoride as fluorinating agents Diphenyl tellurium dfluoride was produced when diphenyl tellurium in acetonitrile was treated at 20° with methyliodine(III) difluoride or 2,2,2-trifluoroethyliodine(IIl) difluoride.  

Xenon difluoride appears to be a convenient source of fluorine for the fluorination of diorganyl telluriums  

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Conjugated, cross-conjugated, and homoconjugated fluoroalkenes react with halogens to yield predominantly 1,4-adducts Results from the reactions of a series of conjugated fluoroalkenes with elemental halogens are summarized in Table 4 In nearly all cases, the fraMs-l,4-addition products are formed exclusively [Il ... 

Halogenation of the B12Hi22- ion with N-halosuccinamide leads to mono- and di-halosubstituted dodecaborates, while reaction with elemental halogens finally led... 

Monohalogenated products are obtained by treatment of this heterocycle (20) with elemental halogens (bromine, chlorine, or iodine) in concentrated sulfuric acid containing silver sulfate. This acidic reaction medium aids electrophilic attack by the positive halogen species on a protonated thienopyridine. Subsequently, nonacidic conditions have been identified for the monobromination reaction <74JHC205>. Monobromination of the isomers (21) and (23) has also been reported <70AK(32)249>. 

Tellurium bis[0-ethyl dithiocarbonate] reacted with elemental halogens or copper(H) halides in chlorinated hydrocarbons as solvents to produce tellurium (0-ethyl dithiocarbonate) halides2,3. 

Mercury bis[pentafluorotelluro(trifluoromethyl)amide] reacted with elemental halogens and interhalogens to yield ha]o(trifluoromethyl)amino tellurium pentafluoride2,3. The less electronegative halogens of the interhalogens join the amide-nitrogen atom. 

Diorgano 2,6-dimethyl-4,4-dioxocyclohexylidene tellurium compounds lost the cyclo-hexylidene group upon treatment with elemental halogens in chloroform2. 

Benzotellurophene and benzotellurophene derivatives with substitu tents at the 2- or 3-position react with elemental halogens in an inert organic solvent to form benzotellurophene 1,1-dihalides in quantitative yields. 

Dibenzotellurophene reacts with elemental halogens to give dibenzotellurophene dihalides in quantitative yields (p. 555). 

The yields of the reactions with elemental halogens are almost quantitative, and with the copper(II) halides 82%. 

The direct nuclear chlorination, bromination, or iodination of pyrazines is usually done with elemental halogen or /V-halogeno succinimide but direct fluorination... 

The halogen is not used directly and therefore the transport, handling and storage problems associated with elemental halogens are avoided. 

The alkanes also react with elemental halogens at high temperatures to produce halogenated hydrocarbons. For example ... 

Unsymmetrically 2,6-disubstituted 4-oxo-4//-tellurins react similarly with elemental halogens. ... 

Oxidation of triorganoantimony and - bismut h(V) compounds with elemental halogen or the equivalent... 

Several diorganoantimony mixed halides have been prepared by the reaction of diorganoantimony halides with elemental halogens as shown in equations 236 and 237 -228 ... 

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