6-Nitrobenzo[c]isoxazole-3-carboxylic acid CAS 6501-77-5
| CAS No. | 6501-77-5 |
| Molecular Formula | C8H4N2O5 |
| Molecular Weight | 208.13 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
6-Nitrobenzo[c]isoxazole-3-carboxylic acid (CAS 6501-77-5) is a high-purity analytical reference standard with the molecular formula C8H4N2O5 and a molecular weight of 208.13 g/mol.
Owing to an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage, 6-Nitrobenzo[c]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 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).
This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.
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.) | 1958 |
| Nitrogen Atoms | 2 |
Related Nitrobenzo Standards
- 5-Nitrobenzo[c]isoxazole-3-carboxylic acid (CAS 146426-39-3)
- 5-Nitrobenzo[d]isoxazole-3-carboxylic acid (CAS 28691-51-2)
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- 2-(5-Nitrobenzo[d]isoxazol-3-yl)ethanol (CAS 642087-62-5)
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Recommended Standards
- 6-Nitro-1H-benzo[d][1,3]oxazine-2,4-dione (CAS 4693-02-1)
- 6-nitro-1,3-benzoxazole-2-carboxylic acid (CAS 944907-31-7)
- 7-Nitro-1H-benzo[d][1,2,3]triazole-5-carboxylic acid (CAS 333767-00-3)
- 5-Nitro-benzooxazole-2-carboxylic acid (CAS 49559-67-3)
- 4-(3,5-Difluorophenyl)-2,2-dimethyl-4-oxobutanoic acid (CAS 898766-68-2)
- 2-(Aminomethyl)-3-(difluoromethyl)-4-iodo-5-methoxypyridine (CAS 1805550-42-8)
- 2,3-Dimethyl-6-nitroanthracene-9,10-dione (CAS 61415-71-2)
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