3-Hydroxyisoxazole-5-carboxylic acid CAS 13626-60-3
| CAS No. | 13626-60-3 |
| Molecular Formula | C4H3NO4 |
| Molecular Weight | 129.07 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Owing to a carbohydrate-derived structure, an amide group, 3-Hydroxyisoxazole-5-carboxylic acid is typically off-white to pale yellow liquid. Its solid-state physicochemical attributes — including a molecular weight of 129.07 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.
3-Hydroxyisoxazole-5-carboxylic acid (CAS 13626-60-3), molecular formula C4H3NO4 and molecular weight 129.07 g/mol, is a CATO reference standard with documented purity and traceability.
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.
CATO manufactures 3-Hydroxyisoxazole-5-carboxylic acid under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C4H3NO4 |
| Molecular Weight | 129.07 g/mol |
| 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) | 4.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1960 |
| Nitrogen Atoms | 1 |
Related Hydroxyisoxazole Standards
- 4-Hydroxyisoxazole-3-carboxylic Acid (CAS 178316-77-3)
- 5-Hydroxyisoxazole-3-carboxylic acid (CAS 933726-73-9)
- 3-Hydroxyisoxazole-5-carboxamide (CAS 14016-01-4)
- N'-Hydroxyisoxazole-5-carboximidamide (CAS 164982-41-6)
- Methyl 3-Hydroxyisoxazole-5-carboxylate (CAS 10068-07-2)
- Methyl 5-hydroxyisoxazole-3-carboxylate (CAS 1557026-77-3)
- 3-Hydroxyisoxazole-5-carbaldehyde (CAS 5777-21-9)
- Ethyl 3-hydroxyisoxazole-5-carboxylate (CAS 13626-61-4)
Recommended Standards
- 1-Aminoimidazolidine-2,4,5-trione (CAS 133559-55-4)
- 2-Oxo-2,3-dihydrooxazole-5-carboxylic acid (CAS 1407858-88-1)
- 2,5-Dioxooxazolidine-4-carbaldehyde (CAS 119941-35-4)
- Dichlorodimethylsilane (CAS 75-78-5)
- N-(2,4-Dichlorophenyl)-2-methoxybenzamide (CAS 331435-43-9)
- 3-Ethylindolizine-1-carboxylic acid (CAS 120221-65-0)
- 6-Bromo-2,2-dimethyl-1,2-dihydronaphthalene (CAS 102568-23-0)
- (2S,3R)-1,3-dimethylazetidine-2-carboxylic acid (CAS 2725774-11-6)
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- 4-Iodo-3-methoxy-2-(trifluoromethoxy)pyridine-5-sulfonyl chloride (CAS 1804362-47-7)
- 6-Methyl-4-oxo-N-(1-(thiophen-2-yl)propyl)-4,5-dihydro-[1,2,3]triazolo[1,5-a]pyrazine-3-carboxamide (CAS 1421585-79-6)
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Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
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