4-Methyl-2-(4-nitrophenyl)oxazole-5-carboxylic acid CAS 1243440-61-0
| CAS No. | 1243440-61-0 |
| Molecular Formula | C11H8N2O5 |
| Molecular Weight | 248.19 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies 4-Methyl-2-(4-nitrophenyl)oxazole-5-carboxylic acid (CAS 1243440-61-0), a certified reference material (molecular formula C11H8N2O5, MW 248.19 g/mol) for analytical method development and quality control.
Structurally, 4-Methyl-2-(4-nitrophenyl)oxazole-5-carboxylic acid (C11H8N2O5) contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 9.0, corresponding to approximately 9 ring(s) or double-bond equivalent(s). With a molecular weight of 248.19 g/mol, it falls into the medium-molecular-weight range. 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), 4-Methyl-2-(4-nitrophenyl)oxazole-5-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 | C11H8N2O5 |
| Molecular Weight | 248.19 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) | 9.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1990 |
| Nitrogen Atoms | 2 |
Related Methyl Standards
- Methyl 2-(4-Nitrophenyl)oxazole-4-carboxylate (CAS 1171126-87-6)
- 5-Methyl-1-(4-nitrophenyl)-1h-1,2,3-triazole-4-carboxylic acid (CAS 1217-99-8)
- Methyl 5-(2-Nitrophenyl)isoxazole-3-carboxylate (CAS 1375064-51-9)
- Methyl 5-(3-nitrophenyl)-1,3-oxazole-4-carboxylate (CAS 1820687-81-7)
- 2-(3-Methyl-4-nitrophenyl)oxazole-4-carboxylic acid (CAS 885273-86-9)
- 5-Methyl-1-(3-nitrophenyl)-1h-1,2,3-triazole-4-carboxylic acid (CAS 929975-73-5)
- 5-Methyl-3-(3-nitrophenyl)isoxazole-4-carboxylic acid (CAS 38694-05-2)
- 5-Methyl-3-(4-nitrophenyl)isoxazole-4-carboxylic acid (CAS 7123-64-0)
Recommended Standards
- 4-Nitro-1-[(3-nitrophenyl)methyl]-1h-pyrazole (CAS 1240569-46-3)
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- 3-Nitro-1-[(3-nitrophenyl)methyl]-1h-pyrazole (CAS 1240566-93-1)
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- 5-Amino-1-(3-(methylsulfonyl)propyl)pyridin-2(1h)-one (CAS 1178431-19-0)
- Ethyl 4-(3-nitropyridin-2-yl)piperazine-1-carboxylate (CAS 478260-18-3)
- 4-Bromo-5-isopropylisoxazole (CAS 1554506-98-7)
- Ethyl 3-chloro-4-(pyrrolidin-1-yl)benzoate (CAS 1072947-64-8)
- (E)-3-Dimethylamino-1-(thien-2-yl)-2-propen-1-one (CAS 154321-55-8)
- Morpholinomethanol (CAS 4432-43-3)
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