Acetic Acid → (R)-(-)-2-propyloctanoic acid

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Under an argon atmosphere, the compound (100 g) produced in Reference Example 3 was dissolved in acetic acid (230 mL) at about 40° C. (inner temperature). A solution of methanesulfonic acid (130 g) in water (182 mL) was added to the above solution, then stirred at about 105-112° C. (inner temperature) for about 13 hours, and cooled to about 28° C. (inner temperature). Then, water (400 mL) and a mixture of n-heptane: isopropyl acetate (5:1) (500 mL) were added and the mixture was extracted. The organic layer was washed twice with water (400 mL) and concentrated to give (2R)-2-propyloctanoic acid having the following physicochemical properties (103 g, 99.3% e.e.).

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