[C:1]([CH:10]1C(=O)O[C:13](C)([CH3:17])[O:12][C:11]1=[O:19])(=[O:9])[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH3:8]>C(O)C>[O:9]=[C:1]([CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH3:8])[CH2:10][C:11]([O:12][CH2:13][CH3:17])=[O:19]The resulting 5-octanoyl-2,2-dimethyl-1,3-dioxane-4,6-dione was allowed to reflux in ethanol for 2 hours, and then concentrated under reduced pressure. The resulting residue was purified using silica gel chromatography (developing solvent: n-hexane/ethyl acetate=8/2) to obtain ethyl 3-oxodecanoate shown by the formula below.
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