Water → 7-beta-Galactosylcoumarin-3-carboxylic acid

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A mixture of 24 g of potassium hydroxide, 80 ml of water, 240 ml of methanol, and 20 g (0.035 mol) of ethyl 7-β-galactosylcoumarin-3-carboxylate [Burd et al, Clin. Chem. 23, 1402 (1977)] was stirred at 50° C. for 15 hours. When cool, the methanol was removed under reduced pressure. The concentrated aqueous solution was acidified to pH 2 with concentrated hydrochloric acid. The precipitate was collected, washed with cold water, and recrystallized from hot water. The crystals were collected, washed with acetone, and dried at 80° C. for 1 hr. This gave 12 g (54% yield) of 7-β-galactosylcoumarin-3-carboxylic acid as white crystals, mp 250°-255° C.

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