Alkyltellurium trichlorides

Like tellurium tetrachloride, aryltellurium (and alkyltellurium) trichlorides (and tribromides) nndergo condensation reactions with reactive organic substrates or metallo-organic reagents as well as addition reactions to C=C bonds, giving rise to tellnrinm dichlorides. 

The reaction can be performed by simply maintaining a mixture of the trichloride and excess ketone (1 3) at room temperature, or by refluxing equimolar amounts of the reagents in benzene. Alkyltellurium trichlorides give only low yields of the products. 

The aryltellurium trihalides are generally more stable than the alkyltcllurium trihalides (alkyltellurium trichlorides, produced by the addition of TcCI to olefins, easily liberate elemental tellurium). 

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