In acid solution, amines are obtained, in alkaline solution, azoxy, azo and hydrazo compounds, and in neutral solution hydroxylamino compounds.
They may also be obtained by the reduction of nitroso compounds and of hydrazo compounds and of hydrazones (J.
They may be prepared by the reduction of nitro compounds in alkaline solution (using zinc dust and alkali, or a solution of an alkaline stannite as a reducing agent); by oxidation of hydrazo compounds; or by the coupling of a diazotized amine and any compound of a phenolic or aminic type, provided that there is a free para position in the amine or phenol.
By oxidizing agents they are converted into azoxy compounds, and by reducing agents into hydrazo compounds or amines.
It melts at 112-114° C. and is easily reduced to the corresponding hydrazo compound.