Réaction #84027

Équation de réaction

Hydrogen

Hydrogen

3-nitrophthalic acid

hydrogen

→

3-aminophthalic acid

Rendement 84.0%

Solvants

ethanol

Conditions de réaction

Traitement

1. 1
   Autrethe mixture was purged with nitrogen 3 times
2. 2
   FiltrationThe suspension was filtered through a celite bed
3. 3
   Lavagerinsed with methanol
4. 4
   ConcentrationThe filtrate was concentrated in vacuo
5. 5
   Autreisolated by vacuum filtration
6. 6
   AutreThe solid was dried in vacuo to a constant weight

Mode opératoire

10% Pd/C (2.5 g), 3-nitrophthalic acid (75.0 g, 355 mmol) and ethanol (1.5 L) were charged to a 2.5 L Parr hydrogenator under a nitrogen atmosphere. Hydrogen was charged to the reaction vessel for up to 55 psi. The mixture was shaken for 13 hours, maintaining hydrogen pressure between 50 and 55 psi. Hydrogen was released and the mixture was purged with nitrogen 3 times. The suspension was filtered through a celite bed and rinsed with methanol. The filtrate was concentrated in vacuo. The resulting solid was reslurried in ether and isolated by vacuum filtration. The solid was dried in vacuo to a constant weight, affording 54 g (84% yield) of 3-aminophthalic acid as a yellow product. 1H-NMR (DMSO-d6) δ: 3.17 (s, 2H), 6.67 (d, 1H), 6.82 (d, 1H), 7.17 (t, 1H), 8-10 (br, s, 2H); 13C-NMR (DMSO-d6) δ: 112.00, 115.32, 118.20, 131.28, 135.86, 148.82, 169.15, 170.09.

Source