2-Methyl-5-oxo-4,5-dihydrooxazole-4-carboxylic acid CAS 906728-33-4
| CAS No. | 906728-33-4 |
| Molecular Formula | C5H5NO4 |
| Molecular Weight | 143.10 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
2-Methyl-5-oxo-4,5-dihydrooxazole-4-carboxylic acid (CAS 906728-33-4), molecular formula C5H5NO4 and molecular weight 143.10 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to a carbohydrate-derived structure, an amide group, 2-Methyl-5-oxo-4,5-dihydrooxazole-4-carboxylic acid is typically off-white to pale yellow liquid. Its solid-state physicochemical attributes — including a molecular weight of 143.10 g/mol — guide the selection of appropriate sample preparation and analytical techniques. 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.
As a certified reference material (CRM), 2-Methyl-5-oxo-4,5-dihydrooxazole-4-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 | 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.) | 1987 |
| Nitrogen Atoms | 1 |
Recommended Standards
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- 2-Methoxyoxazole-5-carboxylic acid (CAS 864659-19-8)
- 3-Methoxy-4-nitro-1H-pyrazole (CAS 400755-41-1)
- ethyl 4-chloro-5-methyl-pyrrolo[3,2-d]pyrimidine-2-carboxylate (CAS 1400764-29-5)
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