Reaktion #749026

Reaktionsgleichung

ethyl 2-hydroxy-6-methylbenzoate

sodium hydroxide

→

2-hydroxy-6-methylbenzoic acid

Ausbeute 94.1%

Lösungsmittel

methanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturthe mixture was heated
2. 2
   Temperaturat reflux for 6 h
3. 3
   Sonstigethe methanol was removed under vacuum
4. 4
   workup.ADDITIONThe aqueous residue was treated with 1 M hydrochloric acid to pH ca. 1
5. 5
   FiltrationThe precipitate was collected by filtration
6. 6
   Waschenwashed with water
7. 7
   Sonstigedried under vacuum

Vorschrift

Step 1 A solution of ethyl 2-hydroxy-6-methylbenzoate (2.04 g, 11.32 mmol) in methanol (25 mL) was treated at rt with 1 M aqueous sodium hydroxide (45.3 mL, 45.3 mmol) and the mixture was heated at reflux for 6 h. The mixture was cooled to rt and the methanol was removed under vacuum. The aqueous residue was treated with 1 M hydrochloric acid to pH ca. 1. The precipitate was collected by filtration, washed with water and dried under vacuum to give 2-hydroxy-6-methylbenzoic acid as a white solid (1.62 g, 94%). 1H NMR (400 MHz, methanol-d4) δ 7.26 (1H, t, J=7.92 Hz), 6.75 (2H, t, J=7.92 Hz), 2.55 (3H, s). Mass spectrum m/z 153.1 (M+H)+.

Quelle