Citric Acid → 2-Amino-3-nitrobenzoic acid

HRID 1470576Notes

Reaction equation

HRID 1470576 reaction equation
[N+:1]([C:4]1[CH:5]=[CH:6][CH:7]=[C:8]2[C:12]=1[NH:11]C(=O)[C:9]2=[O:14])([O-:3])=[O:2].C(O)(=O)CC(CC(O)=O)(C(O)=O)[OH:18]>[OH-].[Na+].OO>[NH2:11][C:12]1[C:4]([N+:1]([O-:3])=[O:2])=[CH:5][CH:6]=[CH:7][C:8]=1[C:9]([OH:14])=[O:18]

Participants

5

Reactant 2

HCID 311Citric AcidHCID 38583087-nitroisatin

Product 1

HCID 2196332-Amino-3-nitrobenzoic acidYield 70%

Reagents, catalysts & solvents 2

HCID 784Hydrogen PeroxideSolventHCID 14798Sodium HydroxideSolvent

Procedure

To a ice cold solution of 7-nitro-1H-indole-2,3-dione (9 g, 47 mmol) in 2 M aqueous sodium hydroxide (50 mL), 30% hydrogen peroxide (9 mL) was added drop wise. The mixture was warmed to room temperature and stirred overnight. The mixture was carefully acidified by addition of a saturated citric acid solution. The solid precipitate was collected by filtration, washed with water and dried in a vacuum oven to get 6 g of the required product as a yellow coloured solid (70%).

Workup

  1. filtrationThe solid precipitate was collected by filtration
  2. washwashed with water
  3. customdried in a vacuum oven

Sources & evidence

ORD record
ord-d991d6357f2e4b74acaf8dc474bf0375
Source dataset
uspto-grants-2015_04
Patent number
US09006454B2

Reaction notes

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