5-Nitrobenzo[d]isoxazole-3-carboxylic acid CAS 28691-51-2
| CAS No. | 28691-51-2 |
| Molecular Formula | C8H4N2O5 |
| Molecular Weight | 208.13 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Owing to an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage, 5-Nitrobenzo[d]isoxazole-3-carboxylic acid is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 208.13 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
5-Nitrobenzo[d]isoxazole-3-carboxylic acid (CAS 28691-51-2) is a high-purity analytical reference standard with the molecular formula C8H4N2O5 and a molecular weight of 208.13 g/mol.
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
As a certified reference material (CRM), 5-Nitrobenzo[d]isoxazole-3-carboxylic acid meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
Physical & Chemical Properties
| Molecular Formula | C8H4N2O5 |
| Molecular Weight | 208.13 g/mol |
| Appearance | Pale yellow to 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 |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1965 |
| Nitrogen Atoms | 2 |
Related Nitrobenzo Standards
- 5-Nitrobenzo[c]isoxazole-3-carboxylic acid (CAS 146426-39-3)
- 6-Nitrobenzo[c]isoxazole-3-carboxylic acid (CAS 6501-77-5)
- 6-Nitrobenzo[d]isoxazole-3-carboxylic acid (CAS 28691-50-1)
- 2-(5-Nitrobenzo[d]isoxazol-3-yl)ethanol (CAS 642087-62-5)
- 6-Nitrobenzo[d]thiazole-2-carbaldehyde (CAS 831-44-7)
- 2-Ethyl-5-nitrobenzo[d]thiazole (CAS 134477-11-5)
- 7-Nitrobenzo[b]thiophene-3-carbaldehyde (CAS 109771-38-2)
- 5-Nitrobenzo[b]thiophene-2-carbaldehyde (CAS 4688-16-8)
Recommended Standards
- 5-Nitro-2H-3,1-benzoxazine-2,4(1H)-dione (CAS 20829-97-4)
- 5-Nitro-benzooxazole-2-carboxylic acid (CAS 49559-67-3)
- 5,6-Dinitroindazole (CAS 59601-91-1)
- 6-nitro-1,3-benzoxazole-2-carboxylic acid (CAS 944907-31-7)
- 2-({[2,5-bis(2,2,2-trifluoroethoxy)phenyl]formamido}oxy)acetic acid (CAS 338394-91-5)
- 5-Cyclopropoxy-4-(trifluoromethyl)pyridin-2-amine (CAS 1243452-43-8)
- 2-(1-Cyclopropyl-ethyl)-5-methyl-2H-pyrazol-3-ylamine 4464AF 957514-15-7 C9H15N3 (CAS 957514-15-7)
- 5-Isocyanato-1,3-dimethylpyrimidine-2,4(1H,3H)-dione (CAS 39513-61-6)
- (3-Amino-6-(5-methylfuran-2-yl)-4-(trifluoromethyl)thieno[2,3-b]pyridin-2-yl)(benzo[d][1,3]dioxol-5-yl)methanone (CAS 625377-84-6)
- 1-Bromo-2-((4-(tert-butyl)phenoxy)methyl)benzene (CAS 1275091-44-5)
- Potassium (3-(tert-butoxycarbonyl)-3-azabicyclo[3.1.0]hexan-1-yl)trifluoroborate (CAS 2095504-38-2)
- 4-((6-Chloro-2-phenylimidazo[1,2-a]pyridin-3-yl)methyl)-2,6-dimethylmorpholine (CAS 439108-21-1)
- (1S,4R)-4-Aminocyclopent-2-enecarboxylic acid hydrochloride (CAS 74201-87-9)
- Liraglutide Impurity 10 TFA Salt (CAS CATO-C4X-199210)
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