Methyl 5-oxo-2,5-dihydroisoxazole-4-carboxylate CAS 166899-06-5
| CAS No. | 166899-06-5 |
| Molecular Formula | C5H5NO4 |
| Molecular Weight | 143.10 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of Methyl 5-oxo-2,5-dihydroisoxazole-4-carboxylate is closely related to a carbohydrate-derived structure, an amide group in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
Methyl 5-oxo-2,5-dihydroisoxazole-4-carboxylate (CAS 166899-06-5) is a high-purity analytical reference standard with the molecular formula C5H5NO4 and a molecular weight of 143.10 g/mol.
Structurally, Methyl 5-oxo-2,5-dihydroisoxazole-4-carboxylate (C5H5NO4) contains a carbohydrate-derived structure, an amide group. 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 143.10 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.
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 | C5H5NO4 |
| Molecular Weight | 143.10 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.) | 2004 |
| Nitrogen Atoms | 1 |
Recommended Standards
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- 1-(2,4-Dinitrophenyl)-3,5-dimethyl-1H-pyrazole-4-carbaldehyde (CAS 1159693-93-2)
- Tirzepatide Impurity 46 (CAS CATO-C4X-324046)
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