5-(4-Methoxyphenyl)isoxazole-3-carboxylic Acid CAS 33282-16-5
| CAS No. | 33282-16-5 |
| Molecular Formula | C11H11NO4 |
| Molecular Weight | 221.21 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of 5-(4-Methoxyphenyl)isoxazole-3-carboxylic Acid is closely related to an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
5-(4-Methoxyphenyl)isoxazole-3-carboxylic Acid (CAS 33282-16-5), molecular formula C11H11NO4 and molecular weight 221.21 g/mol, is a CATO reference standard with documented purity and traceability.
Based on its molecular formula C11H11NO4, 5-(4-Methoxyphenyl)isoxazole-3-carboxylic Acid contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 221.21 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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.
As a certified reference material (CRM), 5-(4-Methoxyphenyl)isoxazole-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 | C11H11NO4 |
| Molecular Weight | 221.21 g/mol |
| Appearance | Off-white to pale 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) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1966 |
| Nitrogen Atoms | 1 |
Related Methoxyphenyl Standards
- 5-(4-Methoxyphenyl)-4,5-dihydro-1,2-oxazole-3-carboxylic acid (CAS 1018051-51-8)
- 3-(3-Methoxyphenyl)-4,5-dihydro-1,2-oxazole-5-carboxylic acid (CAS 1018143-20-8)
- 4-(2-Methoxyphenyl)-3-nitrobut-3-en-2-one (CAS 1417574-80-1)
- (2E)-4-[(2-Methoxyphenyl)amino]-4-oxobut-2-enoic acid (CAS 36847-94-6)
- (Z)-4-((2-Methoxyphenyl)amino)-4-oxobut-2-enoic acid (CAS 31460-26-1)
- (Z)-4-((4-methoxyphenyl)amino)-4-oxobut-2-enoic acid (CAS 24870-10-8)
- 3-(4-Methoxyphenyl)-4,5-dihydro-1,2-oxazole-5-carboxylic acid (CAS 473253-40-6)
- 3-[(3-methoxyphenyl)carbamoyl]prop-2-enoic acid (CAS 306935-71-7)
Recommended Standards
- 5-(4-Methoxybenzyl)oxazolidine-2,4-dione (CAS 614736-57-1)
- 5,5,7-Trimethyl-6-oxo-6,7-dihydro-5H-pyrrolo[2,3-d]pyrimidine-4-carboxylic acid (CAS 2167669-10-3)
- 5-(3,5-Dimethoxyphenyl)-1,3,4-oxadiazol-2-amine (CAS 19949-29-2)
- 5,7-Dimethoxy-1H-indole-2-carboxylic acid (CAS 27508-88-9)
- 4-Chloroindane-2-carboxylic Acid (CAS 1071727-67-7)
- 2-Ethylpteridin-4(3H)-one (CAS 37706-73-3)
- 1'-Tosylspiro[cyclohexane-1,3'-indoline]-5'-carboxylic acid (CAS 2306276-21-9)
- 3-Bromo-5-(2-nitrophenoxy)pyridine (CAS 883106-33-0)
- Diflorasone impurity 3 (CAS CATO-C4X-24803)
- N-Methyl-2-(pyridin-3-yl)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)quinazolin-4-amine (CAS 1417301-02-0)
- (4-(6-(Furan-2-yl)pyridazin-3-yl)piperazin-1-yl)(4-methoxyphenyl)methanone (CAS 923106-92-7)
- 1-(4-methylpiperidin-2-yl)ethan-1-ol (CAS 1339729-15-5)
- 5-Iodo-2-phenyl-2H-benzo[d][1,2,3]triazole (CAS 1403621-52-2)
- Tirzepatide Impurity 13 (CAS CATO-C4X-324013)
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