Lithium methane tellurolates

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 procedure is based on the reaction of lithium ethynyltellurolates (generated by the successive treatment of acetylenes with n-BuLi and elemental tellurium) with iodochloromethane giving ethynylchloromethyl tellurides. Subsequent reaction with lithium telluride forms lithium(ethynyltelluro) methane tellurolates which cyclize via an intramolecular addition of the tellurolate to the ethynyltelluro moiety. ... 

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See also in sourсe #XX -- [ ]

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