137052-08-5

345216-96-8

137052-08-5

Example 1 (Synthesis of 4-acetyltetrahydropyran) In a 10 mL glass flask equipped with a stirring device, a thermometer and a reflux condenser, 0.38 g (2.0 mmol) of methyl 4-acetyltetrahydro-2H-pyran-4-carboxylate (synthesized according to the method of Reference Example 1) of 99% purity and 1.08 mL (10 mmol) of 9 mol/L sulfuric acid were added. The reaction mixture was heated to 120°C under stirring and the reaction lasted for 1.5 hours. Upon completion of the reaction, the reaction mixture was analyzed by gas chromatography (internal standard method) and the formation of 0.25 g (yield: 96%) of 4-acetyltetrahydropyran was confirmed.