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Journal ArticleDOI

Electrochemical reduction of 2,3'-dinitrobenzidine in buffered aqueous methanol

01 Nov 1989-Journal of Applied Electrochemistry (Kluwer Academic Publishers)-Vol. 19, Iss: 6, pp 897-900
TL;DR: In this paper, a suitable mechanism for the reduction of 2,3′-DNB in buffered methanolic solutions is proposed based on the results obtained, and the reduction is shown to transfer ten electrons in the reduction and cyclic voltammetric studies show direct proof for the existence of a nitroso intermediate.
Abstract: 2,2′-dinitrobenzidine (2,3′-DNB) gives a single diffusion-limited irreversible polarographic wave in buffered aqueous methanol. Microcoulometric experiments indicate a transfer of ten electrons in the reduction and cyclic voltammetric studies show direct proof for the existence of a nitroso intermediate. Based on the results obtained, a suitable mechanism is proposed for the reduction of 2,3′-DNB in buffered methanolic solutions.
Citations
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Patent
10 Sep 2001
TL;DR: In this article, the colouring agents for keratin fibres containing [1.1'-biphenyl]-2.4-diamine derivatives of general formula (I) or physiologically acceptable, water soluble salts thereof were described.
Abstract: The invention relates to colouring agents for keratin fibres containing [1.1'-biphenyl]-2.4-diamine derivatives of general formula (I) or physiologically acceptable, water soluble salts thereof in addition to novel [1.1'-biphenyl]-2.4-diamine derivatives.

1 citations

References
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Journal ArticleDOI
TL;DR: In this paper, the electrochemical reduction of 2-nitrobenzidine (I) has been investigated in N,N-dimethylformamide solutions and two well-defined polarographic waves in the ratio 1:3 were obtained.

12 citations

Journal ArticleDOI
TL;DR: In this article, the reduction of the nitro and carbonyl groups in 2•nitro•fluorenone, 2•7•dinitrofluorenon, and 2•5•din·fluorene has been studied in buffered solutions over a pH range of about 1−13.
Abstract: The polarographic reduction of the nitro and carbonyl groups in 2‐nitro‐fluorenone, 2,7‐dinitrofluorenone, and 2,5‐dinitrofluorenone has been studied in buffered solutions over a pH range of about 1–13. To aid in interpreting the electrode reactions, additional polarographic studies were made with several compounds containing only the nitro or carbonyl group. These compounds were fluorenone, 4‐nitrobiphenyl, 4,4'‐dinitrobiphenyl, 2.4'‐dinitrobiphenyl, 2,5‐dinitrofluorene, and 2‐aminofluorenone, and the polarography was carried out under the same solution conditions. The number of electrons involved in the reduction steps of several of these compounds was measured using the controlled cathode potential technique. It was found that the characteristic double waves of the carbonyl group in fluorenone are merged into a single two‐electron wave in the dinitrofluorenones. This effect is apparently a general one, caused by the decrease in stability of the intermediate free radical brought about by the hydroxylamine groups in the aromatic nucleus.

6 citations