抄録
(1) The electrolytic reduction potentials (R. P.) of o-, m- and p-nitra-nilines were measured by the polarographic method.
(2) Since nitraniline is a weak base, the reduction in a suitable acidic solution took place in two stages, that is, the reductions of the dissociated and undissociated molecules.
(3) R. P. of dissociated molecules are more positive than those of undissociated molecules.
(4) On the reducibility of o-, tn- and p-nitranilines, meta is more reducible than ortho and para. This may be due to alternating polarity of benzene ring.
(5) R. P. of ionic form of nitraniline is more reducible than nitrobenzene but R. P. of molecular form is less reducible than it, but m-derivative is an exception. We may suggest that NH2, group is electropositive.
