5-Sulfobenzene-1,2,4-tricarboxylic acid → HCID 86586462, compound

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Reaction Steps

5-Sulfo-1,2,4-benzenetricarboxylic acid (9.63 g, 33.2 mmol), prepared according to J. Am. Chem. Soc. (1949) 71, 11, was treated with acetic anhydride (150 mL) and refluxed for 5 hours. After cooling to room temperature, the acetic anhydride was removed under reduced pressure. The residue was washed with diethyl ether (3×30 mL) and then dried under reduced pressure at room temperature to provide the title compound as a tan solid.

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