Lithium phenyl tellurolate

Method C To a solution of lithium phenyl tellurolate (prepared in situ from Te (2 mmol) and PhLi (2.0 M, 1 mL, 2 mmol)) in THE (5 mL)) is added benzyl bromide (0.342 g, 2 mmol) at -78°C. The mixture is warmed at 25°C and stirred for 30 min. At this stage the conversion into phenyl benzylteUuride is complete. The subsequent Li-Te exchange and reaction with an electrophile are the same as described for method A. 

Sodium benzenetellurolate is arylated in liquid ammonia via photoinduced reactions with aryl halides3,4. Aryl iodides reacted with sodium benzenetellurolate in the presence of copper(I) iodide in hexamethylphosphoric triamide (but not in DMF or DMSO) to produce aryl phenyl tellurium compounds5- However, lithium benzenetellurate reacted with 1,2-bromoiodobenzene and lithium methane tellurolate with 1,2-dibromobenzene in tetrahydrofuran at 20° to yield l,2-bis[organotelluro]benzenes6. 

The reaction has been rationalized as involving an attack of lithium tellurolate on a lithi-ated sulphone, promoting the elimination of lithium phenyl sulphinate and the formation of a labile epitelluride that readily collapses into stilbene and elemental tellurium. 

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See also in sourсe #XX -- [ , ]

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