Reaktion #2161297

Reaktionsgleichung

ethyl 1-(4-methoxybenzyl)-1H-1,2,3-triazole-4-carboxylate

LiOH.H2O

→

title compound

Ausbeute 94.0%

1-(4-methoxybenzyl)-1H-1,2,3-triazole-4-carboxylic acid

Ausbeute 94.0%

Lösungsmittel

MeOH H2O

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe mixture was evaporated
2. 2
   workup.ADDITIONthe residue was diluted with water (250 mL)
3. 3
   Extraktionextracted with Et2O (3×75 mL)
4. 4
   Sonstigeto remove neutral impurities
5. 5
   Filtrationthe precipitate was filtered

Vorschrift

To a mixture of ethyl 1-(4-methoxybenzyl)-1H-1,2,3-triazole-4-carboxylate (190.0 g, 0.73 mol) and MeOH/H2O (350 mL/100 mL) was added LiOH.H2O (42.0 g, 0.97 mol) in portions at 0° C. and the reaction mixture was stirred at room temperature overnight. The mixture was evaporated, the residue was diluted with water (250 mL), then extracted with Et2O (3×75 mL) to remove neutral impurities. The aqueous layer was adjusted to pH=3-4 with conc. HCl and the precipitate was filtered to afford the title compound (160 g, 94.0%) as a white solid.

Quelle