Tellurium Dibenzoate

Alkoxycarbonylmethyl alkyl tellurium react with dibenzoyl peroxide in chloroform to produce alkoxycarbonylmethyl alkyl tellurium dibenzoates ° . 

Butyl /-Menthoxycarbonylmethyl Tellurium Dibenzoate 3,8 g (10 mmol) of butyl menthoxycarbonylmethyl tellurium are dissolved in 25 ml of chloroform and a solution of 2.4 g (10 mmol) of benzoyl peroxide in 25 m/ of chloroform is added. The mixture is heated under reflux for 1 h, the chloroform is allowed to evaporate at 20°, and the residue is stored for 4 days to allow the product to crystallize. The product is filtered off, washed with water, and dried in vacuum yield 5.4 g (86%) m.p. 133°. 

Diphenyl Tellurium Dibenzoate 3.5 g (10 mmol) of diphenyl tellurium dichloride are dissolved in 50 m/ of dioxane and 5 g (22 mmol) of silver benzoate are added to the stirred dioxane solution at 20°. The mixture is then heated under reflux for 4 h, filtered, and the filtrate evaporated. The residue is recrystaUized from benzene/hexane (1/9, v/v) yield 4.8 g (92%) m.p. 161°. 

The first compound containing a telluroazepine ring, ll-(4-methylphenyl) dibenzo[d,/][l,4]telluroazepine 62 was obtained in 21% yield upon heating p-xylene solution of 9-azido-9-(4-methylphenyl)telluroxanthene at 130-140°C (87KGS279). Other products of this pyrolitic process are the imine 63 (32% yield) and phenanthridine 64 (21% yield). Formation of the latter implies extrusion of the tellurium atom from dibenzotelluroazepine 62. 

Dibenzo[d,g][l,5]telluroazocines 65 are the only representatives of Te, N-containing eight-membered heterocycles known thus far. Treatment of bis(2-bromomethylphenyl)tellurium dibromide 66 with methylamine followed by reduction of the reaction mixture with sodium sulfide gives, instead of the expected... 

A -methyl-5//,7//-dibenzo[d,.g][l,5]telluroazocine 65, its thiooxide 67a (X=S, R= Me) (95JA6388). The same type of reaction with benzylamine and sodium selenide gives A-benzyl-5//,7//-dibenzo[d,g][l,5]telluroazocine selenoxide 67b (X = Se, R = CH2Ph). Reaction of the tellurium dibromide 66 with sodium sulfide carried out in the absence of the primary amines affords the eight-member Te,S-containing heterocycle 5//,7//-dibenzo[d,g][l,5]telluroazocine (92CL151). 

The reactions of the dibenzo derivative of the tellurapyrylium cation, 10-telluroniaanthracene, were studied in considerable detail. In general, the reactions of tellurapyrylium salts are similar to those of their oxygen, sulfur, and selenium analogs. The peculiar chemical behavior caused by the presence of a tellurium center is most clearly manifested in the reaction of tellurapyrylium cations bearing dimethylamino groups with halogens. 

Alkali metal hydrogen sulfites reduced dibenzo-1,4-oxatellurin 10,10-diacelate to dibenzo-1,4-oxatellurin and diphenyl tellurium diacetate to diphenyl tellurium5. Other reducing... 

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. 

Tellurium replaced the sulfur dioxide group in dibenzothiophene S. -dioxide to give dibenzo tellurophene. 

The chemistry of tellurophene, benzo[6]tellurophene, and dibenzo-tellurophene during the period 1972-1974 has been briefly reviewed in a general review101 concerning the organic tellurium compounds. 

Ch. 1 Tellurium Containing Heterocycles Reviews, Distinguishing Features, and Utility Ch. 2 TeUurophenes, DihydroteUurophenes, Tetrahydrotellurophenes, and Benzo and Dibenzo... 

A review entitled thiophenes from Viktor Meyer to Poly (thiophene) some reactions and synthesis was published in a special issue of Phosphorus, Sulfur and the related elements (13PS287). Over 80 reaction schemes are presented outlining important discoveries in the chemistry of thiophenes. Another review generalized published data on the reactions of 4-(2-R-aryl)-1,2,3-thia- and selenadiazoles (13RJOC479). Special emphasis on the use of these selenadiazole for the synthesis of 1-benzothiophenes, 1-benzosele-ophenes, and their more complex derivatives was presented. A recent review on recent advances in the use of the Wfllgerodt-Kindler reaction in thiophene syntheses appeared this year (13CSV7870). Extensive reviews on selenium and tellurium chemistry from small molecules to biomolecules and materials (B-13M001) as well as data on the synthesis, reactions, crystal structures, and spectral characteristics of benzo[b]tellurophene, dibenzo[b,d]... 

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