Ethanol → 11-ethoxyundecanoic acid

HRID 1461005Notes

Reaction equation

HRID 1461005 reaction equation
Br[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][CH2:10][CH2:11][C:12]([OH:14])=[O:13].[OH-].[K+].[CH2:17]([OH:19])[CH3:18]>C(OCC)(=O)C>[CH2:17]([O:19][CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][CH2:10][CH2:11][C:12]([OH:14])=[O:13])[CH3:18]

Participants

5

Reactant 3

HCID 702EthanolHCID 14797Potassium HydroxideHCID 1781211-Bromoundecanoic acid

Product 1

HCID 47232311-ethoxyundecanoic acidYield 35%

Reagents, catalysts & solvents 1

HCID 8857Ethyl AcetateSolvent

Procedure

11-bromoundecanoic acid (2.25 g, 8.47 mmol) was added to a solution of potassium hydroxide (2.15 g, 38.3 mmol) in absolute ethanol (20 mL) and refluxed for 7 hrs. After cooling and acidification with HCl, solvent was removed under reduced pressure to give a white solid. The sample was dissolved in ethyl acetate and extracted with water. The organic phase was dried over sodium sulfate, and the solvent was removed under reduced pressure. The product was purified by silica column chromatography in 1% diethyl ether/0.3% formic acid/methylene chloride. Solvent was removed under reduced pressure to yield 11-(ethoxy)undecanoic acid (680 mg, 35%): mp 44-45.5° C.; 1H NMR (300 MHz, CDC13) δ 1.20 (t, 3H, J=7.0, CH3), 1.24-1.40 (bm, 12H, methylene envelope), 1.52-1.68 (bm, 4H, O-CH2 -CH2 ; CH2 -CH2 -COOH), 2.34 (t, 2 H, J=7.5, CH2 -COOH), 3.41 (t, 2H, J=6.8, O-CH2 -CH2), 3.48 (q, 2H, J=7.0, O-CH2 -CH3), 10.25 (br, 1H, COOH); 13C NMR (75.4 MHz, CDCL3) δ 15.27, 24.75, 26.23, 29.11, 29.26, 29.40, 29.55*, 29.80, 34.12, 66.06, 70.76, 179.71; m/z 231 (M+H+).

Workup

  1. temperaturerefluxed for 7 hrs
  2. temperatureAfter cooling
  3. customacidification with HCl, solvent was removed under reduced pressure
  4. customto give a white solid
  5. extractionextracted with water
  6. dry with materialThe organic phase was dried over sodium sulfate
  7. customthe solvent was removed under reduced pressure
  8. customThe product was purified by silica column chromatography in 1% diethyl ether/0.3% formic acid/methylene chloride
  9. customSolvent was removed under reduced pressure

Sources & evidence

ORD record
ord-5672ee2b0efc4f0d92ad772db9d4d040
Source dataset
uspto-grants-1991_12
Patent number
US05073571

Reaction notes

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