Methyl 5-formyl-3-methylisoxazole-4-carboxylate CAS 161126-47-2
| CAS No. | 161126-47-2 |
| Molecular Formula | C7H7NO4 |
| Molecular Weight | 169.13 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
Methyl 5-formyl-3-methylisoxazole-4-carboxylate (CAS 161126-47-2) is a high-purity analytical reference standard with the molecular formula C7H7NO4 and a molecular weight of 169.13 g/mol.
The molecular framework of Methyl 5-formyl-3-methylisoxazole-4-carboxylate (C7H7NO4) is characterized by an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. 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.
Physical & Chemical Properties
| Molecular Formula | C7H7NO4 |
| Molecular Weight | 169.13 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (faint amine-like odor) |
| 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) | 5.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2003 |
| Nitrogen Atoms | 1 |
Related Methyl Standards
- Methyl 4-formyl-3-methylisoxazole-5-carboxylate (CAS 161126-53-0)
- Ethyl 2-formyl-1,3-oxazole-4-carboxylate (CAS 181633-60-3)
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Recommended Standards
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- 4-Methoxy-2-nitrophenol (CAS 1568-70-3)
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- n-(Sec-butyl)-5-ethyl-4-methylthiophene-2-carboxamide (CAS 1208451-57-3)
- 3,5-Dimethylmorpholine-4-carboxamidine (CAS 108641-44-7)
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