Sodium Hydroxide → 57403-74-4

Temperature

125 °C

At room temperature, 60 g of [(R)-1-methylpentyl]-malonic acid (0.318 mol) were dissolved in 120 ml of xylene in a three-neck flask with internal thermometer, condenser and stirrer. The mixture was heated to 125° C. for 5 h. After cooling to 25° C., the mixture was admixed with 200 ml of 2N sodium hydroxide solution. After phase separation, the aqueous phase was admixed with 200 ml of ether and, with cooling, with 180 ml of 15% by weight hydrochloric acid. After phase separation, the aqueous phase was extracted twice with 100 ml of ether. The combined organic phases were washed with 50 ml of water and then dried over sodium sulfate. After solvent had been distilled off, (R)-3-methylheptanoic acid was distilled and obtained in a yield of 35.5 g (77% of theory) with >99% ee and >99% chemical purity (b.p.: 67-68° C. at 0.45 mbar).

1. temperatureAfter cooling to 25° C.
2. customAfter phase separation
3. temperaturewith cooling, with 180 ml of 15% by weight hydrochloric acid
4. customAfter phase separation
5. extractionthe aqueous phase was extracted twice with 100 ml of ether
6. washThe combined organic phases were washed with 50 ml of water
7. dry with materialdried over sodium sulfate
8. distillationAfter solvent had been distilled off
9. distillation(R)-3-methylheptanoic acid was distilled
10. customobtained in a yield of 35.5 g (77% of theory) with >99% ee and >99% chemical purity (b.p.: 67-68° C. at 0.45 mbar)

ORD record

ord-ee3a769c614d4b6d876bb3dfdcbc7f59

Source dataset

uspto-grants-2009_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07534908B2