Ethyl 2-(1,4-dioxaspiro[4.5]decan-8-yl)acetate → 2-(1,4-Dioxaspiro(4.5)decan-8-yl)acetic acid

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A solution of ethyl 1,4-dioxaspiro[4,5]decane-8-acetate (50.0 g) in 50 mL of 4.8N sodium hydroxide solution and 400 mL of ethanol is refluxed under nitrogen for 2 hours. The mixture is concentrated in vacuo to remove the ethanol. The residue is acidified with a saturated sodium biphosphate solution and the mixture is extracted with ethyl acetate (2×300 mL). The organic extract is dried over magnesium sulfate, and evaporated in vacuo to give an oily solid which is triturated with hexane and filtered to give 38.25 g of the title compound as a white solid; mp 110°-113° C.

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