2- phenyl tellurium trichloride

Telluroxanthene is prepared from bis(2-lithiophenyl)methane and elemental tellurium or by the cyclization of 2-(phenylmethyl)phenyl tellurium trichloride promoted by AICI3. 

Methylphenoxatellurin-lO, 10-dichloride7 2-(4-Methylphenoxy)-phenyl tellurium trichloride (16.8 g, 40 mmol) are heated in a large test tube at 200-240°C in an oil bath for 0.5 h with occasional stirring. The deep red solid is cooled, ground and recrystallized from acetone to give pale yellow plates. Yield 12.2 g (80%), m.p. 275°C. 

Methylphenylthiosnlfooato Phenyl Tellurium2 Phenyl tellurium trichloride is dissolved in dry ethyl acetate, 3 molar equivalents of potassium 4-methylbenzenethiosulfonate dissolved in methanol are added, and the mixture is heated under reflux. The hot mixture is filtered, the filtrate is concentrated lo a volume of 5 to 10 m/, and cooled. The orange crystals are collected, recrystallized from methanol, dried, and stored under nitrogen m.p. 138°. 

Phenyl Bis[henzaldehyde thiosemicaihazone] Tellurium Chloride2 A solution of 1.0 g (3.2 mmol) phenyl tellurium trichloride in 30 ml methanol is added to a solution of 2.3 g (12.8 mmol) benzaldehyde thiosemicarbazone in 30 ml of warm water. The mixture is stirred for 0.5 h and then set aside for 12 h. The yellow crystals of the product arc filtered and recrystallized from methanol yield 79% m.p. 70- 72°. 

Bis 2-aminophenyl] Ditellurium7 A solution of 9.5 g (255 mmol) of sodium borohydride in 200 ml 1 M aqueous sodium hydroxide is gradually added to a vigorously stirred suspension of 41.5 g (100 mmol) of 2-(phenylazo)phenyl tellurium trichloride in 500 ml ethanol. When the tellurium trichloride has completely dissolved and the solution has become colorless, the solution is poured into 800 ml water. Air is blown through the mixture until no more ditellurium compound forms. The red crystals are collected by filtration, washed with water, dried, and recrystallizcd from benzene/hexane (1 1) yield 89% m.p. 99-101°. 

The identity of bis pentafluorophenyl ditellurium obtained by the reduction of pentafluoro-phenyl tellurium trichloride by zinc in ethanol6,7 seems to be uncertain8. l,4-Bis[trichlorotelluro]benzene9 and 2,2 -bis[trichlorotelluro]biphenyl10 were reduced to polymeric ditellurium compounds that were insoluble in organic solvents. 

Sulfuryl chloride and diphenyl ditelluriumin chloroform gave phenyl tellurium trichloride in 80% yield3. 

Phenyl tellurium trichloride and triarylarsane dioximates reacted with replacement of one chloride for a dioximate group1. 

When the reaction between phenyl tellurium trichloride and sodium diethyldithiocarba-mate was carried out with a 1 2 molar ratio of the reagents, one chlorine atom remained with the tellurium2. 

Aryl tellurium trichlorides and equimolar amounts of chlorotriphenylstannane produce in refluxing toluene aryl phenyl tellurium dichlorides2 3. Tetraphenyl tin and phenyl tellurium trichloride yielded diphenyl tellurium dichloride2. 

When phenyl tellurium trichloride or 4-phenoxyphenyl tellurium trichloride were reacted with sodium 2-benzoyl-5-methoxyphenoxide in a refluxing mixture of benzene/methanol, compounds were obtained that contained chloride and phenoxide groups3. 

Sodium alkoxides or phenoxides reacted with phenyl tellurium trichloride producing aryl tellurium trialkoxides or triphenoxides in yields of approximately 70% f... 

Phenyl Tellurium Tris(2-formylphenox(de]Sodium 2-formylpheuoxide is prepared by reacting 4.88 g (40 mmol) of 2-formylphenol with 0.92 g (40 mmol) of sodium in 20 ml of methanol. The phenoxide is suspended in 50 ml of benzene under nitrogen, a solution of 3.11 g (10 mmol) of phenyl tellurium trichloride in 50 ml of benzene is added, the mixture is heated under reflux for 2 h, cooled, and centrifuged to separate the solids. The liquid is decanted, the residue is extracted with benzene, and the combined extracts are concentrated at 40 - 50° under reduced pressure until crystals appear. The mixture is cooled, filtered, the solid washed with dry hexane, and the yellow crystals are dried under vacuum yield 4.3 g (75%) m.p. 156°. Similarly prepared were ... 

Phenyl tellurium trichloride (2 mol) and triarylarsane dioximates reacted in refluxing benzene to produce phenyl tellurium dichloride oximates5. 

Phenyl Tellurium Dichloride Diphenylketoximate1 To a solution of 0.62 g (2 mmol) phenyl tellurium trichloride in 30 ml benzene is added a solution of 0.698 g (1.0 mmol) triphenylarsane bis[diphenyl-ketoximate] in 20 ml benzene. The mixture is refluxed lor 3 h and then filtered. The filter cake is washed with two 5-ml portions of benzene. The colorless product melted at 214° (dec.) yield 85%. 

Phenyl tellurium trichloride (1 mol) and sodium diethyldithioearbamatc (2 mol) in dichloromethane yielded, in a rapid reaction, phenyl tellurium bis[diethyldithiocarbamate] chloride1. 

When 2-methoxycycloalkyl phenyl telluriums, prepared from cycloalkenes and phenyl tellurium trichloride in methanol, are treated with 3-chloroperoxybenzoic acid, the elimination of the phenyltelluro group is accompanied by ring-contraction and formation of the dimethyl acetals of formylcycloalkanes2 3. 

Triphenyl Telluronium Phenylbromotrichlorotellurate(IV)8 25 ml of chloroform, 1.31 g (3 mmol) of triphenyl telluronium bromide, and 0.93 g (3 mmol) phenyl tellurium trichloride are placed in a 100 ml flask fitted with a reflux condenser. The mixture is heated under reflux for 4 h, the solvent is evaporated, and the residue is recrystallized from dichloromethane/ethyl acetate yield 1.91 g (85%) m.p. 194°. 

Telluraxanthene Te.Te-dichloride is formed when 2-(phcnylmethyl)-phenyl tellurium trichloride is heated in 1,2-dichlorobenzene at 70° in the presence of aluminum trichloride1,2. 

Phenothiatellurin 10,10-dichloride was obtained when 2-(phenylthio)-phenyl tellurium trichloride was heated at 250°u 2... 

Phenothiatellurin 10,10-Dichloride1 2.1 g(5 mmol)of 2-(phenylthio)-phenyl tellurium trichloride are placed in a test tube and heated at 250° for 30 min. The melt is stirred, cooled, and the dark yellow solid is dissolved in acetone. The solution is filtered, and the filtrate is concentrated and cooled to crystallize the product yield 0.8 g (42%) m.p. 265-270°. 

Methylphenylimino)methyl]phenyl Tellurium Trichloride A solution of 2.16 g (16 mmol) sulfuryl chloride in 20 ml chloroform is added dropwisc to a vigorously agitated solution of 3.0 g (8 mmol) 2[(4 -methylphcnylimino)methyl]phenyl butyl tellurium in 40 ml chloroform. The yellow precipitate is collected by filtration, washed with diethyl ether, and dried yield 89% m.p. 272-277°. 

In the 1 1 adducts of phenyl tellurium trichloride or tribromide with aluminum tribromide or gallium trichloride, the tellurium compound serves as the halide donor. 

Most of the complexes have well defined melting points. They appear to be monomeric in solution . An interesting method for the preparation of thiazolidine-2-thione complexes of aryl tellurium trichlorides is the addition of the tellurium compound to a melt of the ligand kept at 110°. Complexes with 1 1, 1 2, and 1 4 stoichiometries (Te-compound ligand) were obtained after recrystallization from dry methanol. Phenyl tellurium trichloride complexes with thiourea appear to form only when an organic solvent is used as the reaction medium in aqueous media the trichloride is reduced to the monochloride that is isolated as the thiourea adduct . 

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