4-Hydroxyisoxazole-3-carboxylic Acid CAS 178316-77-3
| CAS No. | 178316-77-3 |
| Molecular Formula | C4H3NO4 |
| Molecular Weight | 129.07 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
CATO manufactures 4-Hydroxyisoxazole-3-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.
4-Hydroxyisoxazole-3-carboxylic Acid (CAS 178316-77-3), molecular formula C4H3NO4 and molecular weight 129.07 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to a carbohydrate-derived structure, an amide group, 4-Hydroxyisoxazole-3-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. 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 | 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.) | 2007 |
| Nitrogen Atoms | 1 |
Related Hydroxyisoxazole Standards
- 3-Hydroxyisoxazole-5-carboxylic acid (CAS 13626-60-3)
- 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
- 2-Oxo-2,3-dihydrooxazole-5-carboxylic acid (CAS 1407858-88-1)
- 3-Oxo-2,3-dihydroisoxazole-4-carboxylic acid (CAS 178316-78-4)
- 2-oxo-2,3-dihydro-1,3-oxazole-4-carboxylic acid (CAS 406183-40-2)
- 1-Aminoimidazolidine-2,4,5-trione (CAS 133559-55-4)
- 3-Nitro-2-(piperazin-1-yl)benzoic acid (CAS 374063-97-5)
- 4-Methyl-2-((2-methylbutyl)amino)pentan-1-ol (CAS 1247153-97-4)
- 1-(4-Butoxy-3-chlorophenyl)propan-1-one (CAS 1443311-15-6)
- 5-Bromo-N-(2-methyl-2H-tetrazol-5-yl)furan-2-carboxamide (CAS 586995-58-6)
- 1-[(5-chlorothien-2-yl)sulfonyl]-4-phenylpiperidine-4-carboxylic acid (CAS 851619-66-4)
- (S)-5-Amino-4-(4-amino-1-oxoisoindolin-2-yl)-5-oxopentanoic Acid (CAS 874760-72-2)
- 8-Benzyl-4-chloro-2-methyl-6-phenylimidazo[1,5-a]pyrimidine (CAS 88875-10-9)
- Enrofloxacin (CAS 93106-60-6)
- 2,6-Dimethyl-3-morpholinoaniline (CAS 1138341-41-9)
- Peptide 439 (CAS CATO-CPTD788439)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com