[C:1]([OH:12])(=[O:11])[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][C:8]([OH:10])=O>C(OC(=O)C)(=O)C>[O:12]1[C:1](=[O:11])[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][C:8]1=[O:10]A solution of suberic acid (5.0 g, 28.7 mmol) in acetic anhydride (10 mL) was heated at reflux for 1 h. After cooling to RT, the solvent was removed in vacuo. The pale yellow residue was recrystallized from acetonitrile. After filtration and drying to the vacuum pump, the oxonane-2,9-dione was obtained as a white solid (2.26 g, 50.4% yield).
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