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A simple and efficient protocol for the synthesis of sym. substituted azoarenes from nitroarenes by using ammonium bromide as hydrogen donor and magnesium powder as catalyst at room temp. in methanol media is described.  Various azoarenes contg. few addnl. substituents such as halogen, Me, hydroxyl, methoxy, ethoxy etc. functions have been synthesized in a single step by the use of this reagent.  The conversion is clean, rapid, chemo-selective and high yielding. [on SciFinder(R)

Synthesis of azoarenes by reductive dimerization of nitroarenes using ammonium bromide and magnesium