Colloidal nickel was easily prepared by reaction of nickel bromide with zinc powder. It was an active catalyst for hydrogenation of aromatic nitro compounds and of halobenzenes. Aromatic nitro compounds were hydrogenated to give the corresponding amines in high yields in the presence of the colloidal nickel under an atmospheric pressure of hydrogen. p-Bromonitrobenzene was hydrogenated successively to afford aniline via p-bromoaniline. p-Bromoaniline and p-chloroaniline were reduced to aniline in good yields. It is suggested that the amino moiety assists the adsorption of the substrate on the surface of the metal and that it acts as an acceptor of hydrogen halide. The hydrogenation of halobenzenes gave benzene in the presence of aniline. The reactivity of halobenzenes was in the following order;1>Br>Cl.kn-abstract=
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