Sodium thienyl tellurolate

Amines are regenerated from the protecting derivatives trichloro-f-butylcarbamates by treatment with sodium 2-thienyl tellurolate. The reagent is generated in a catalytic cycle by reduction of the corresponding diteUuride with sodium borohydride. 

Method G. ° A catalytic cycle is also involved in this method. Sodium thienyl tellurolate, generated from the ditelluride and NaBH4, attacks a bromine atom and the formed tel-lurenyl bromide reacts with another tellurolate molecule regenerating the starting ditelluride. 

Sodium hydrogen telluride, sodium 0,0-diethyl phosphorotellurolate, alkali 2-thienyl tellurolates and bis(triphenylstannyl) telluride °/KF reduce a-haloketones to the corresponding ketones. 

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