Reaction #84027

Reaction equation

Hydrogen

Hydrogen

3-nitrophthalic acid

hydrogen

→

3-aminophthalic acid

Yield 84.0%

Solvents

ethanol

Conditions

Workup

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

Procedure

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