Methanol → 2-Carbomethoxy 4,5-dichlorobenzoic acid

HRID 715996

Reaktionsgleichung

Reaktionsgleichung von HRID 715996
[H-].[Na+].[Cl:3][C:4]1[CH:5]=[C:6]2[C:11](=[O:12])[O:10][C:8](=[O:9])[C:7]2=[CH:13][C:14]=1[Cl:15].[CH3:16][OH:17]>>[Cl:15][C:14]1[C:4]([Cl:3])=[CH:5][C:6]([C:11]([OH:10])=[O:12])=[C:7]([C:8]([O:17][CH3:16])=[O:9])[CH:13]=1

Komponenten

4

Edukt 3

HCID 887Methanol2×HCID 24758Sodium hydrideHCID 703344,5-Dichlorophthalic anhydride

Produkt 1

HCID 198042632-Carbomethoxy 4,5-dichlorobenzoic acid

Versuchsvorschrift

To methanol (200 mL) was added sodium hydride (2.72 g, 60% dispersion, 68.0 mmol) portionwise under nitrogen at ambient temperature. To the solution was then added a solution of 4,5-dichlorophthalic anhydride (5.90 g, 27.2 mmol) in methanol (50 mL) dropwise under nitrogen at room temperature. The reaction was stirred for one hour and then concentrated to remove the methanol. The residue was taken up in aqueous 10% potassium carbonate solution and extracted with ethyl acetate (2×). The aqueous portion was acidified to pH 2 with 10% hydrochloric acid and extracted with ethyl acetate (3×), dried (Na2SO4) and concentrated to afford the title compound. 1H NMR (300 MHz, DMSO-d6) δ ppm 3.81 (s, 3H) 7.94-8.01 (m, 2H) 13.60-13.70 (br, 1H); MS (+DCI/NH3) m/z 266.0 [M+NH4]+.

Aufarbeitung

  1. concentrationconcentrated
  2. customto remove the methanol
  3. extractionextracted with ethyl acetate (2×)
  4. extractionextracted with ethyl acetate (3×)
  5. dry with materialdried (Na2SO4)
  6. concentrationconcentrated

Quellen und Nachweise

ORD-Eintrag
ord-8367126190964017a4493fe24d669fe1
Quelldatensatz
uspto-grants-2015_11
Patentnummer
US09187483B2

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