Methyl 4-(isoxazol-3-yl)benzoate CAS 1823904-36-4
| CAS No. | 1823904-36-4 |
| Molecular Formula | C11H9NO3 |
| Molecular Weight | 203.19 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Methyl 4-(isoxazol-3-yl)benzoate (C11H9NO3) contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage. It is notably hygroscopic, its high carbon-to-hydrogen ratio confers good lipid solubility, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. The high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.
Methyl 4-(isoxazol-3-yl)benzoate (CAS 1823904-36-4), molecular formula C11H9NO3 and molecular weight 203.19 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.
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 | C11H9NO3 |
| Molecular Weight | 203.19 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1995 |
| Nitrogen Atoms | 1 |
Related Methyl Standards
- Methyl 4-(isoxazol-5-yl)benzoate (CAS 1196059-61-6)
- 1-(Isoxazol-3-yl)-3-phenylurea (CAS 55807-72-2)
- N-(isoxazol-4-yl)-2-phenylacetamide (CAS 1389313-62-5)
- Phenyl isoxazol-4-ylcarbamate (CAS 1190843-61-8)
- (Isoxazol-4-ylsulfonyl)glycine (CAS 1706455-07-3)
- Methyl 5-(isoxazol-5-yl)-3-methyl-1H-pyrazole-4-carboxylate (CAS 175277-15-3)
- Ethyl 5-(isoxazol-3-yl)-1,2,4-oxadiazole-3-carboxylate (CAS 1343187-68-7)
- 3-(5-Ethyl-isoxazol-3-yl)-3-oxo-propionic acid methyl ester (CAS 1229627-42-2)
Recommended Standards
- (4-(Difluoromethyl)-6-methoxy-2-methylpyridin-3-yl)methanol (CAS 1807110-94-6)
- 2-Methoxyquinoline-8-carboxylic acid (CAS 1824140-76-2)
- 2-(Difluoromethyl)-6-methoxy-4-methylpyridine-3-methanol (CAS 1807110-47-9)
- Methyl 3-Formylindole-2-carboxylate (CAS 18450-26-5)
- Proline Impurity 3 (CAS 2812-47-7)
- Benzyl ((1-((S)-2-aminopropanoyl)pyrrolidin-2-yl)methyl)(cyclopropyl)carbamate (CAS 1354025-76-5)
- 2-fluoro-4-(oxetan-3-yl)benzaldehyde (CAS CATO-C3D-262183)
- Hexanitrodiphenylamine (CAS 131-73-7)
- 1-Acetyl-5-(2-aminopropyl)indoline-7-carbonitrile (CAS 175837-01-1)
- Solvent Red 26 (CAS 4477-79-6)
- Pentoxyverine Impurity 17 (CAS CATO-C4X-227017)
- 4-Ethyl-2-methyl-2,3-dihydrofuro[2,3-b]quinoline (CAS 540803-82-5)
- 2,3',5',6-Tetrabromodiphenyl Ether (CAS 446254-41-7)
- Semaglutide impurity 286 (CAS CATO-C4X-2226286)
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