5-Amino-2-hydroxy-3-nitrobenzoic acid CAS 945-20-0
| CAS No. | 945-20-0 |
| Molecular Formula | C7H6N2O5 |
| Molecular Weight | 198.13 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of 5-Amino-2-hydroxy-3-nitrobenzoic acid is closely related to an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
5-Amino-2-hydroxy-3-nitrobenzoic acid (CAS 945-20-0) is a high-purity analytical reference standard with the molecular formula C7H6N2O5 and a molecular weight of 198.13 g/mol.
Owing to an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage, 5-Amino-2-hydroxy-3-nitrobenzoic acid is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 198.13 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C7H6N2O5 |
| Molecular Weight | 198.13 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (faint amine-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO, water |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
| Nitrogen Atoms | 2 |
Related Amino Standards
- 4-Amino-2-hydroxy-5-nitrobenzoic acid (CAS 197584-93-3)
- 2-amino-4-hydroxy-5-nitrobenzoic acid (CAS 574738-65-1)
- 4-Amino-3-hydroxy-5-nitrobenzoic acid (CAS 1394916-93-8)
- Methyl 6-amino-5-nitropyridazine-3-carboxylate (CAS 1379171-16-0)
- 2-Amino-6-methyl-3,5-dinitropyridine (CAS 25864-34-0)
- 4-Amino-6-oxo-1,6-dihydropyrimidin-5-yl 2-amino-2-oxoacetate (CAS 98198-21-1)
- 2-Amino-1-(2-fluoro-4-nitrophenyl)ethan-1-one (CAS 1492187-86-6)
- 2-Amino-1-(5-fluoro-2-nitrophenyl)ethan-1-one (CAS 1495651-18-7)
Recommended Standards
- 5,6-Difluoro-3-nitro-1H-indole (CAS 2138239-73-1)
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- 6,7-Difluoroquinazoline-2,4(1H,3H)-dione (CAS 769158-54-5)
- 4-Fluoro-N-(2-(pyridin-3-yl)pyrimidin-4-yl)benzamide (CAS 866143-39-7)
- (4R,4'R)-2,2'-(4-Chloropyridine-2,6-diyl)bis(4-(3,5-di-tert-butylphenyl)-4,5-dihydrooxazole) (CAS 2808461-10-9)
- 4-Methoxynaphthalen-1-amine hydrochloride (CAS 92599-05-8)
- 1-(3-(Trifluoromethyl)benzyl)pyrrolidin-3-ol (CAS 870858-92-7)
- (S)-2-((4-Chloro-6-((4-nitrophenyl)amino)-1,3,5-triazin-2-yl)amino)pentanedioic acid (CAS 61955-61-1)
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