Hydrogen Peroxide → 4-Methanesulphinyl-3-nitrobenzoic acid

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Reaction Steps

The starting materials were prepared as follows: 4-Methanesulphinyl-3-nitrobenzoic acid 4-Methylthio-3-nitrobenzoic acid (4.36 g, 20 mM) was dissolved in acetic acid (200 ml), and treated at ambient temperature with H2O2 (2.5 ml, 30%, 22 mN). After stirring at ambient temperature for 4 days, excess peroxide was decomposed with sodium metabisulfite, and solvent evaporated. The residue was purified by chromatography on silica, eluting with methanol, to give 4-methanesulphinyl-3-nitrobenzoic acid (4.1 g, 89%), mp 238-2390. Nmr (DMSO-d6): δ 2.90 (s, 3H); 8.29 (d, 1H); 8.56 (dd, 1H); 8.68 (d, 1H).

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