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1. WO1989005293 - PROCEDE DE PURIFICATION D'ALKYLES DE TELLURE ET DE SELENIUM

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

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Claims
1. A method of purification of a tellurium or selenium alkyl
characterised by forming an adduct of the alkyl with at least one compound of a group 11 or 12 metal (Cu, Ag, Au, Zn, Cd, Hg) and
thermally dissociating the said adduct to yield the alkyl.
2. A method of purification according to claim 1 characterised in that the tellurium or selenium alkyl is a dialkyl.
3. A method of purification according to claim 1 or 2 characterised in that each alkyl group in the tellurium or selenium alkyl contains 1 to 4 carbon atoms.
4. A method of purification according to any one of claims 1, 2 or 3 characterised in that the alkyl is a tellurium alkyl.
5. A method according to claim 1 characterised in that the compound of a group 11 or 12 metal is a halide or nitrate thereof.
6. A method of purification according to claim 5 characterised in that the metal compound is a chloride, bromide or iodide.
7. A method of purification according to claim 6 characterised in that the at least one compound of a group 11 or 12 metal is selected from Cul, Cdl 2, CdBr 2, HgCl 2 Cu 2I 2 and Hgl 2.
8. A method of purification according to claim 1 characterised in that the adduct is formed by reaction between the alkyl and the metal compound in an organic solvent.
9. A method according to claim 3 characterised in that the solvent is selecte! from ethers, alcohols and nitriles and mixtures thereof.
10. A methoi of purification according to claim 1 characterised in that the adduct is dissociated at 80ºC - 150°C.
11. A method of purification according to claim 1 characterised in that diethyl tellurium is purified by forming an adduct with a compound selected from Cdl 2, CdBr 2, HgCl 2, Cul 2, and Hgl 2 ani then thermally dissociating the adduct and collecting the alkyl.
12. A method of purification according to claim 1 characterised in that diisopfopyl tellurium is purified by forming an adduct with a compound selected from CdI 2 and CdBr 2 and then thermally dissociating the adduct and collecting the alkyl.

13. An adduct of dialkyl tellurium having a formula, selected from following:
((C2H5)2Te)2CdI2
(C2H5)2Te(CdBr2)2
((C2H5)2Te)2CdBr2
((i-C3H7)2Te)2CdI2
((i-C3H7)2Te)2Cd-Br2
(i-C3H7)2TeCdI2