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A catalytic reduction of aromatic nitro compounds to aromatic amino compounds with hydrazine in the presence of Fe(III) chloride and active carbon was studied. The corresponding amino compounds were obtained with excellent purities and in good yields. The method was also applied to the partial reduction of dinitro compounds.

Reductions with components of water gas (CO/H2O) can be catalyzed by selenium; thus nitroarenes are transformed in the presence of metallic selenium and triethylamine into arylamines. H2Se may plausibly be assumed as the reaction species. In a control experiment, nitrobenzene and H2Se underwent quantitative conversion (under N2) into aniline.

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It was found that the reactions of l,4-diacetoxy-2-butyne and related acetylenic compounds with carboxylic acids are efficiently catalyzed by silver salts to give the corresponding enol acetates in good yield.