- The reduction of benzofuroxans by ferrous salts and by thiophenol
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Treatment of benzofuroxan derivatives with ferrous sulphate in DMSO/water solution affords in high yield o-nitroanilines. o-Nitroaniline was also obtained by reduction of benzofuroxan with thiophenol in presence of catalytic amount of Fe2+ or Fe3+ salts.
- Gasco,Medana,Gasco
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- Palladium(II)-catalyzed, heteroatom-directed, regioselective C-H nitration of anilines using pyrimidine as a removable directing group
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A new palladium-catalyzed, heteroatom-directed strategy for C-H nitration of anilines is described. This C-H functionalization reaction is highly ortho-selective and results in very good yields. The highlight of the work is the use of pyrimidine as the removable directing group. This approach constitutes one of the rare methods of ortho-nitration of anilines, a reaction that is normally very difficult to achieve via traditional approaches.
- Pawar, Govind Goroba,Brahmanandan, Abhilashamole,Kapur, Manmohan
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p. 448 - 451
(2016/02/18)
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- Nitroanilines are the reduction products of benzofuroxan system by oxyhemoglobin (HbO22+)
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Benzofuroxans are interesting compounds which display several biochemical and pharmacological properties. Recent studies from our laboratory demonstrate that they are reduced by ferrous salts at room temperature and that the principal reaction products are o-nitroanilines. This paper shows that simple benzofuroxan derivatives are also able to oxidise HbO22+ to methemoglobin (MetHb3+) (UV detection) and to form o-nitroanilines (HPLC detection). From a toxicological point of view this reaction is interesting, since it indicates that the blood is a site for metabolism of these compounds with consequent methemoglobinemia and formation of toxic compounds.
- Medana, Claudio,Visentin, Sonja,Grosa, Giorgio,Fruttero, Roberta,Gasco, Alberto
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p. 799 - 802
(2007/10/03)
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- Non-reductive conversion of 1-nitro-9,10-anthraquinone to 1-amino-9,10-anthraquinones
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Heating 1-nitro-9,10-anthraquinone 2 with ureas 4 in N,N,N',N'-tetramethylurea (TMU) at around 130 °C resulted in the displacement of the nitro group by the amino groups, leading to the corresponding aminoanthraquinones 5 in good yields.
- Suzuki,Kawakami,Maeda
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p. 9217 - 9220
(2007/10/02)
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- The Rearragement of Aromatic Nitro Compounds. Part 1. The Reactions of Nitroanilines in Aqueous Sulphuric Acid
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A number of substituted 2-nitroanilines rearange in concentrated sulphuric acid at 110 deg C to yield products that appear to be derived from 1,3-migration of the 2-nitro-group.For 2,3-dinitroaniline, the rate of reaction is almost independent of acidity over the range 83-97percent sulphuric acid and the solvent isotope effect k(H2SO4)/k(D2SO4) is 1.3-1.9.Methyl and t-butyl groups, when present as additional substituents in 2,3-dinitroaniline, have only a small effect on the reaction rate but 3-methyl-2-nitroaniline reacts much more slowly than 2,3-dinitroaniline.These results are discussed in terms of a rate-determining migration of the 2-nitro group following protonation at the 2-position.
- Murphy, J. Timothy,Ridd, John H.
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p. 1767 - 1772
(2007/10/02)
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