Tellurium Monochloride

The reaction very likely proceeds through the disproportionation of 4-ethoxyphenyl tellurium monochloride to tellurium and the diaryl tellurium dichloride. Bis[trifluoromethyl] tellurium transferred its trifluoromethyl groups to iodine, sulfur, selenium, phosphorus, arsenic, and antimony on heating with the elements, sulfur dichloride, selenium tetrabromide, or the triiodides of phosphorus, arsenic, and antimony at 170 to 220° in sealed tubes3. 

Aryl tellurium trichlorides treated with the thiosemicarbazides ofbenzaldehydes or methyl phenyl ketones produced the thiosemicarbazone complexes of the aryl tellurium monochlorides . 

Selenium and tellurium are converted into their respective tetrachlorides by thionyl chloride, whilst gold, mercury, bismuth, arsenic, antimony, tin and iron give a mixture of the metallic chloride with sulphur dioxide and sulphur monochloride,2 for example ... 

Sulphur, selenium and tellurium are soluble in the oxychloride in the cold, but on heating, reaction may take place. Sulphur interacts to form selenium monochloride, sulphur monochloride and sulphur dioxide. Tellurium is converted into its tetrachloride. Both red and yellow phosphorus react violently with the oxychloride, forming phosphorus pentoxide and selenium mono- and tetra-chlorides. Carbon, silicon and boron are unattacked. 

Pyrosulphuryl chloride, sulphuryl chloride, thionyl chloride and sulphur monochloride all convert tellurium into the tetrachloride, the reaction proceeding most readily with the last named. In the case of thionyl chloride and sulphur monochloride the product is tellurium dichloride if the tellurium is present in excess.3 With pyrosulphuryl chloride the compound formed is TeCl4.SOs when this is acted upon by dry ammonia the product contains tellurium nitride.4... 

Tellurium Tetrachloride, TeCl4.—When chlorine is passed continually over carefully heated tellurium, the final product is a yellow liquid which solidifies to a crystalline mass on cooling. It can be purified by distillation.10 The chlorine can be replaced by sulphur monochloride,11 or even by sulphuryl chloride or thionyl chloride 12... 

Tellurium dioxide is also converted into the tetrachloride by the action of sulphur monochloride or even hydrogen chloride (see p. 381). 

Although stable in dry air, the tetrachloride is gradually decomposed by moisture it deliquesces, giving an oxychloride. This oxychloride is probably only a mixture of tetrachloride and dioxide.3 With a larger quantity of water the tetrachloride dissolves, giving rise finally to tellurium dioxide. It is soluble without decomposition in aqueous hydrochloric acid (from which an unstable compound HCl.TeCl4.5H20 crystallises at —30° C.), also in carbon disulphide and sulphur monochloride.4... 

When heated in sulphur monochloride vapour, tellurium dioxide is readily attacked with formation of tellurium tetrachloride or dichloride, according as to whether the sulphur monochloride or the tellurium dioxide is present in excess.10... 

Selenium and tellurium are attacked at room temperature, arsenic being liberated and selenium monochloride or tellurium tetrachloride formed.6... 

Selenium dioxide and tellurium dioxide react with 1,3-diketone dioximes unsubstituted at position 2, to give compounds (198) and (199), respectively. Selenium monochloride and tellurium tetrachloride give identical results (Scheme 88) (49JCS274, 79BSF(2)199). 

Diorgano tellurium diiodides, but not dibromides and dichlorides, form 1 1 molecular adducts with iodine, iodine monochloride, and iodine monobromide. 

Diphenyl Tellurium Chloride Iodide1 1.12 g (4 mmol) of diphenyl tellurium is dissolved in 50 ml of diethyl ether, the solution is cooled to — 5°, and 0.65 g (4 mmol) of iodine monochloride dissolved in 5 ml of diethyl ether are added dropwise to the stirred solution. Stirring is continued for 1 h, and the orange-red precipitate is filtered off and dried under vacuum yield 1.6 g (90%) m.p. 204°. 

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 . 

ESTANO (Spanish) (7440-31-5) Finely divided material is combustible and forms explosive mixture with air. Contact with moisture in air forms tin dioxide. Violent reaction with strong acids, strong oxidizers, ammonium perchlorate, ammonium nitrate, bis-o-azido benzoyl peroxide, bromates, bromine, bromine pentafluoride, bromine trifluoride, bromine azide, cadmium, carbon tetrachloride, chlorine, chlorine monofluoride, chlorine nitrate, chlorine pentafluoride, chlorites, copper(II) nitrate, fluorine, hydriodic acid, dimethylarsinic acid, ni-trosyl fluoride, oxygen difluoride, perchlorates, perchloroethylene, potassium dioxide, phosphorus pentoxide, sulfur, sulfur dichloride. Reacts with alkalis, forming flammable hydrogen gas. Incompatible with arsenic compounds, azochloramide, benzene diazonium-4-sulfonate, benzyl chloride, chloric acid, cobalt chloride, copper oxide, 3,3 -dichloro-4,4 -diamin-odiphenylmethane, hexafluorobenzene, hydrazinium nitrate, glicidol, iodine heptafluoride, iodine monochloride, iodine pentafluoride, lead monoxide, mercuric oxide, nitryl fluoride, peroxyformic acid, phosphorus, phosphorus trichloride, tellurium, turpentine, sodium acetylide, sodium peroxide, titanium dioxide. Contact with acetaldehyde may cause polymerization. May form explosive compounds with hexachloroethane, pentachloroethane, picric acid, potassium iodate, potassium peroxide, 2,4,6-trinitrobenzene-1,3,5-triol. 

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