3-Oxo-2,3-dihydroisoxazole-4-carboxylic acid CAS 178316-78-4
| CAS No. | 178316-78-4 |
| Molecular Formula | C4H3NO4 |
| Molecular Weight | 129.07 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies 3-Oxo-2,3-dihydroisoxazole-4-carboxylic acid (CAS 178316-78-4), a certified reference material (molecular formula C4H3NO4, MW 129.07 g/mol) for analytical method development and quality control.
Owing to a carbohydrate-derived structure, an amide group, 3-Oxo-2,3-dihydroisoxazole-4-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.
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
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 | 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 Oxo Standards
- 2-Methyl-2,3-dihydroisoxazole-4-carboxylic acid (CAS 1260758-16-4)
- Methyl 4,5-dihydroisoxazole-3-carboxylate (CAS 50491-29-7)
- 3-Propyl-4,5-dihydroisoxazole-5-carbonitrile (CAS 190907-50-7)
- 4,5-Dihydroisoxazole-3-carboxylic Acid (CAS 4485-98-7)
- Ethyl 4,5-dihydroisoxazole-5-carboxylate (CAS 114120-87-5)
- 5-Methyl-4,5-dihydroisoxazole-3-carbohydrazide (CAS 89417-90-3)
- 3-Phenyl-4,5-dihydroisoxazole (CAS 14397-33-2)
- 3-Methyl-4,5-dihydroisoxazole-5-carbonitrile (CAS 86260-83-5)
Recommended Standards
- 4-Hydroxyisoxazole-3-carboxylic Acid (CAS 178316-77-3)
- 2-oxo-2,3-dihydro-1,3-oxazole-4-carboxylic acid (CAS 406183-40-2)
- 2-Oxo-2,3-dihydrooxazole-5-carboxylic acid (CAS 1407858-88-1)
- 4-Amino-1,2,5-oxadiazole-3-carboxylic Acid (CAS 78350-50-2)
- Aroclor 1262 (CAS 37324-23-5)
- 2-Isopropyl-2,4,5,6-tetrahydrocyclopenta-[c]pyrazol-3-amine (CAS 1480316-34-4)
- 1-(5-Chloro-2-methoxyphenyl)-2,2-difluoroethan-1-one (CAS 1335113-22-8)
- 2-Amino-3-fluorobenzoic acid (CAS 825-22-9)
- 4-Oxo-1,4-dihydrobenzo[h]quinoline-3-carboxylic acid (CAS 51726-83-1)
- Dapsone Hydroxylamine (CAS 32695-27-5)
- N-(3-Methoxyphenyl)-2-oxo-1,2-dihydroquinoline-3-carboxamide (CAS 62033-69-6)
- Solifenacin Related Compound 6 HCl (CAS 52250-51-8)
- 4,5-Dibromo-3-chlorotoluene (CAS 953794-53-1)
- Neuropeptide Y (13-36) (human, rat) (CAS 122341-40-6)
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