5-Isoxazolecarboxylic Acid CAS 21169-71-1
Purity 97%+In StockPharmaceutical Standards
| CAS No. | 21169-71-1 |
| Molecular Formula | C4H3NO3 |
| Molecular Weight | 113.07 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies 5-Isoxazolecarboxylic Acid (CAS 21169-71-1), a pharmaceutical standards reference standard manufactured under ISO 17034 accreditation. Molecular formula: C4H3NO3. Molecular weight: 113.07 g/mol. Batch-specific COA and technical support are available on request.
Physical & Chemical Properties
| Molecular Formula | C4H3NO3 |
| Molecular Weight | 113.07 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.) | 1963 |
| Nitrogen Atoms | 1 |
Related Isoxazolecarboxylic Standards
- 5-Isoxazolecarboxylic Acid Methyl Ester (CAS 15055-81-9)
- 3-Isoxazolecarboxylic acid, methyl ester (CAS 25742-68-1)
- 5-Isoxazolecarboxylic acid hydrazide (CAS 855746-95-1)
- 5-acetyl-3-Isoxazolecarboxylic acid (CAS 145441-17-4)
- 133674-35-8 5-Isoxazolecarboxylic acid, 3-(1-methylethyl)-, methyl ester (9CI) (CAS 133674-35-8)
- 5-phenyl-3-isoxazolecarboxylic acid (CAS 14441-90-8)
- 3-Isoxazolecarboxylic acid, 4-phenyl-, ethyl ester (CAS 96129-46-3)
- 4-Isoxazolecarboxylic acid, 3-(5-fluoro-2-pyridinyl)-5-methyl-, ethyl ester (CAS 1159252-10-4)
Recommended Standards
- 4-Nitro-1H-pyrazole (CAS 2075-46-9)
- Ethyl 5-Methyloxazole-2-carboxylate (CAS 33123-68-1)
- 3-Nitropyrazole (CAS 26621-44-3)
- 3-Hydroxy-6-methylpicolinonitrile (CAS 727736-69-8)
- 2,4,5-Trimethoxybenzaldehyde (CAS 4460-86-0)
- 3-Bromo-5-(1,4-dioxa-8-azaspiro[4.5]decan-8-yl)phenylboronic acid (CAS 2377608-48-3)
- 2-(Propylsulfonyl)-2,6-diazaspiro[3.3]heptane (CAS 1707398-91-1)
- (4-(Isopentyloxy)-2,6-dimethylphenyl)methanol (CAS 1443310-64-2)
- 3,4-Bis(2-(2-(2-(decyloxy)ethoxy)ethoxy)ethoxy)benzaldehyde (CAS 656821-30-6)
- Semaglutide impurity 74 (CAS CATO-C4X-222674)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
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- Technical support: +86 13829788188 / jacky.chen@cato-chem.com