[CH:1]12[CH2:7][CH:4]([CH:5]=[CH:6]1)[CH2:3][CH:2]2[C:8]([OH:10])=[O:9].C(O)=[O:12].OO.S([O-])([O-])=O.[Na+].[Na+]>O>[OH:12][CH:5]1[CH:6]2[CH:1]3[CH:2]([CH2:3][CH:4]1[CH2:7]3)[C:8](=[O:10])[O:9]2With 328.2 g of 5-norbornene-2-carboxylic acid was mixed 240.6 of formic acid. Below 50° C., 254.5 g of 35% aqueous hydrogen peroxide was added dropwise to the mixture over 6 hours. After the completion of addition, the reaction mixture was poured into a mixture of 1.5 liters of water and 0.8 kg of sodium sulfite. After three times of extraction with 1 liter of ethyl acetate, the organic phase was washed with water, dried, and concentrated in vacuum. The residue was dissolved in 1.2 liters of methanol, to which a catalytic amount of potassium carbonate was added. This was agitated for one hour at room temperature. The methanol was distilled off under vacuum, followed by conventional extraction and washing. There was obtained 247.6 g of 2-hydroxy-4-oxatricyclo[4.2.1.03,7]nonan-5-one. The yield was 65.5%.
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