4-Methylisoxazole-3-carboxylic Acid CAS 215872-46-1
| CAS No. | 215872-46-1 |
| Molecular Formula | C5H5NO3 |
| Molecular Weight | 127.10 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
4-Methylisoxazole-3-carboxylic Acid (CAS 215872-46-1), molecular formula C5H5NO3 and molecular weight 127.10 g/mol, is a CATO reference standard with documented purity and traceability.
Structurally, 4-Methylisoxazole-3-carboxylic Acid (C5H5NO3) contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 4.0, corresponding to approximately 4 ring(s) or double-bond equivalent(s). With a molecular weight of 127.10 g/mol, it falls into the low-molecular-weight range. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
As a certified reference material (CRM), 4-Methylisoxazole-3-carboxylic Acid meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
Physical & Chemical Properties
| Molecular Formula | C5H5NO3 |
| Molecular Weight | 127.10 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.) | 2018 |
| Nitrogen Atoms | 1 |
Related Methylisoxazole Standards
- 3-Methylisoxazole-5-carboxylic Acid (CAS 4857-42-5)
- 4-Methylisoxazole-5-carboxylic Acid (CAS 261350-46-3)
- 5-Methylisoxazole-4-ethanol (CAS 1526803-92-8)
- 5-Methylisoxazole-4-carboxamide (CAS 1097817-28-1)
- N-Methylisoxazole-5-carboxamide (CAS 116235-70-2)
- 3-Methylisoxazole-4-carboxamide (CAS 1314959-75-5)
- 3-Methylisoxazole-5-carboxamide (CAS 38955-11-2)
- 4-Methylisoxazole-3-carboxamide (CAS 38061-70-0)
Recommended Standards
- 4-Methyl-3-nitropyrazole (CAS 38858-90-1)
- 4-methyl-1-nitro-1H-pyrazole (CAS 38858-82-1)
- 4-methyloxazole-5-carboxylic acid (CAS 2510-32-9)
- 4-Methyl-1,2,5-oxadiazole-3-carboxamide (CAS 32551-33-0)
- N-Nitroso-4-Piperidinol (CAS 55556-93-9)
- Brompyrazon (CAS 3042-84-0)
- 1-((6-Chloropyridin-2-yl)methyl)-1H-1,2,4-triazole-3-carbonitrile (CAS 1520473-28-2)
- 1-(2-((Tetrahydrofuran-2-yl)methoxy)ethyl)-1h-pyrazol-4-amine (CAS 1248793-64-7)
- N-(3-Methyl-1,2-oxazol-5-yl)-2-(morpholin-4-yl)acetamide (CAS 91977-78-5)
- 3-Boc-9-benzyl-3,9-diazaspiro[5,5]undecane (CAS 929302-01-2)
- 3-Methylpentadecane (CAS 2882-96-4)
- 898780-79-5 1-(4-Methylphenyl)-3-[4-(methylsulfanyl)phenyl]propan-1-one DTXSID80644360 (CAS 898780-79-5)
- 3-Amino-6-methyl-1-(2-(4-methylpiperidin-1-yl)-2-oxoethyl)pyridin-2(1H)-one (CAS 1443292-49-6)
- Tirzepatide Impurity 18 (CAS CATO-C4X-324018)
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