5-Methyl-4-nitroisoxazole-3-carboxylic Acid CAS 960225-75-6
| CAS No. | 960225-75-6 |
| Molecular Formula | C5H4N2O5 |
| Molecular Weight | 172.10 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Owing to a carbohydrate-derived structure, an amide group, 5-Methyl-4-nitroisoxazole-3-carboxylic Acid is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 172.10 g/mol — guide the selection of appropriate sample preparation and analytical techniques. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
5-Methyl-4-nitroisoxazole-3-carboxylic Acid (CAS 960225-75-6) is a high-purity analytical reference standard with the molecular formula C5H4N2O5 and a molecular weight of 172.10 g/mol.
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.
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 | C5H4N2O5 |
| Molecular Weight | 172.10 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) | 5.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1988 |
| Nitrogen Atoms | 2 |
Related Methyl Standards
- Methyl 5-nitroisoxazole-3-carboxylate (CAS 1367269-14-4)
- 3-Methyl-4-nitroisoxazole-5-carboxylic acid (CAS 89282-13-3)
- Methyl 3-nitroisoxazole-5-carboxylate (CAS 40995-06-0)
- Ethyl 3-nitroisoxazole-5-carboxylate (CAS 1224593-92-3)
- Ethyl 5-nitroisoxazole-3-carboxylate (CAS 155088-43-0)
- 5-Nitroisoxazole-3-carboxylic acid (CAS 1368191-38-1)
- 3-Nitroisoxazole-5-carboxamide (CAS 1224594-00-6)
- 3-Methyl-4-nitroisoxazole-5-carbaldehyde (CAS 6436-64-2)
Recommended Standards
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