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In a flask made of glass having an inner volume of and equipped with a stirring device, a thermometer and a reflux condenser were charged 0.38 g (2.0 mmol) of 4-acetyl-4-methoxycarbonyltetrahydropyran with a purity of 99% and synthesized in the same manner as in Reference example 1 and 2.52 ml (10 mmol) of 4 mol/l hydrochloric acid, and the mixture was reacted at 120° C. for 4 hours with stirring. After completion of the reaction, when the reaction mixture was analyzed by gas chromatography (Internal standard method), 0.23 g (Reaction yield: 90%) of 4-acetyltetrahydropyran was found to be formed.

1. customIn a flask made of glass
2. customequipped with a stirring device
3. customthe mixture was reacted at 120° C. for 4 hours
4. customAfter completion of the reaction, when the reaction mixture