It forms a well-crystallized hydrazone with phenylhydrazine; and a-nitroso propionic acid with hydroxylamine.
On the nitroso, nitroso-ammonium and nitroso-diammonium compounds see C. E.
The first class includes those substances which require no preliminary treatment, and comprises the amides and ammonium compounds, pyridines, quinolines, alkaloids, albumens and related bodies; the second class requires preliminary treatment and comprises, with few exceptions, the nitro-, nitroso-, azo-, diazoand amidoazo-compounds, hydrazines, derivatives of nitric and nitrous acids, and probably cyanogen compounds.
The principal chromophores are the azo, -N = N -, azoxy, = N 2 O, nitro, - N02, nitroso, - NO, and carbonyl, = CO, groups.
The nitroso group is less important.
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