Reduction of other nitrogenated compounds

Hydrogen telluride reduces hydroxylamines to anilines, and nitroso, azo and azoxy compounds to the corresponding hydrazo compounds. -  

The reduction of azo compounds to hydrazo compounds is also achieved by means of aryltellurols or sodium hydrogen telluride. The last reagent (generated from NaBH4 and 

Te catalyst) reduces tertiary amine iV-oxides to the corresponding amines.Azides are reduced to primary amines by sodium hydrogen telluride.  

Typical procedure Te powder (140 mg, 1.09 mmol) and NaBH4 (95 mg, 2.5 mmol) were refluxed in EtOH (4 mL) for 45-60 min. The resulting deep purple solution was cooled at -20°C then 0.12 mL of AcOH in 0.5 mL of EtOH was added followed by the substrate (0.5 mmol) in 1 mL of benzene. The reaction mixture was stirred (-20°C, room temperature) at the indicated temperature for the indicated time. Then, the reaction flask was opened to air and a small amount of silica gel added. After 1 h, the mixture was filtered through Celite and chromatographed on silica gel. 

The treatment of aziridine sulphonates bearing a trityl or benzydryl group at the nitrogen atom, with Na2Te promotes the opening of the aziridine ring giving allyamines  

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