Sulfuric Acid → HCID 15132837, compound

Participants

Reaction Steps

Sodium nitrite (2.4 g) was added dropwise to a stirred solution of 3-methoxycarbonyl-2-methyl-4-methylsulphenylbenzamide (4.2 g) in a mixture of concentrated sulphuric acid (50 ml), water (40 ml) and glacial acetic acid (70 ml) whilst maintaining the temperature below 5° C. The mixture was stirred without cooling for 0.5 hours. The brown solution was recooled to 0° C. and water (200 ml) was added. The mixture was extracted with ether (3×150 ml). The combined organic extracts were washed with water (2×150 ml), dried (anhydrous magnesium sulphate) and filtered. The filtrate was evaporated to dryness to give 3-methoxycarbonyl-2-methyl-4-methylsulphenylbenzoic acid (4.6 g) as a sticky orange solid NMR (CDCl3) 2.1(s,3H), 2.5(s,3H), 3.9(s,3H), 7.0(d, 1H), 7.85(d, 1H), 9.0(bs, 1H).

Provenance & Evidence