Ethyl 5-methylisoxazole-3-carboxylate CAS 3209-72-1
| CAS No. | 3209-72-1 |
| Molecular Formula | C7H9NO3 |
| Molecular Weight | 155.15 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of Ethyl 5-methylisoxazole-3-carboxylate 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.
Ethyl 5-methylisoxazole-3-carboxylate (CAS 3209-72-1), molecular formula C7H9NO3 and molecular weight 155.15 g/mol, is a CATO reference standard with documented purity and traceability.
Ethyl 5-methylisoxazole-3-carboxylate (C7H9NO3) contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage. It is notably hygroscopic, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
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 | C7H9NO3 |
| Molecular Weight | 155.15 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) | 4.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
| Nitrogen Atoms | 1 |
Related Ethyl Standards
- 3-Ethyl-5-methylisoxazole-4-carboxylic acid (CAS 17147-85-2)
- 3-Ethyl-4-methylisoxazole-5-carboxylic acid (CAS 874289-75-5)
- Ethyl 3-methylisoxazole-4-carboxylate (CAS 20328-15-8)
- Ethyl 4-methylisoxazole-3-carboxylate (CAS 38061-69-7)
- Ethyl 4-methylisoxazole-5-carboxylate (CAS 261350-50-9)
- 3-Methylisoxazole-4-sulfonic acid (CAS 747406-57-1)
- 5-Methylisoxazole-4-sulfonic acid (CAS 773051-56-2)
- 4-Methylisoxazole-5-carbonyl chloride (CAS 1108713-21-8)
Recommended Standards
- Ethyl 5-Methyl-1H-1,2,4-triazole-3-carboxylate (CAS 40253-47-2)
- Ethyl-4-methyl-3,5-oxazole carboxylate, 97% (CAS 76284-27-0)
- Ethyl 4-Methyl-1H-1,2,3-triazole-5-carboxylate (CAS 4343-73-1)
- Methyl (E)-2-cyano-3-ethoxyacrylate (CAS 71363-39-8)
- Osmium(III) chloride trihydrate (CAS 135296-80-9)
- 4-Bromo-n,3-dimethylaniline (CAS 80948-74-9)
- 5-Formyl-1-methyl-1H-imidazole-2-carbonitrile (CAS 944900-78-1)
- Morpholino(1-(6-(thiophen-2-yl)pyridazin-3-yl)piperidin-4-yl)methanone (CAS 1029761-45-2)
- Brivudine Impurity N2 (CAS 69304-49-0)
- 1-Cyclopentyl-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrrole (CAS 2223046-27-1)
- 3-Furancarboxylic Acid (CAS 488-93-7)
- 2-(4-Fluoro-3-methylphenyl)ethane-1-thiol (CAS 1267967-99-6)
- Nicotelline (CAS 494-04-2)
- Insulin B (22-25) (CAS 34367-73-2)
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