3-(tert-Butyl)-5-methylisoxazole-4-carboxylic acid CAS 90643-64-4
| CAS No. | 90643-64-4 |
| Molecular Formula | C9H13NO3 |
| Molecular Weight | 183.20 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 183.20 g/mol gives 3-(tert-Butyl)-5-methylisoxazole-4-carboxylic acid distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
3-(tert-Butyl)-5-methylisoxazole-4-carboxylic acid (CAS 90643-64-4), molecular formula C9H13NO3 and molecular weight 183.20 g/mol, is a CATO reference standard with documented purity and traceability.
3-(tert-Butyl)-5-methylisoxazole-4-carboxylic acid (C9H13NO3) 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 presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
CATO manufactures 3-(tert-Butyl)-5-methylisoxazole-4-carboxylic acid under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C9H13NO3 |
| Molecular Weight | 183.20 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 |
| 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.) | 1982 |
| Nitrogen Atoms | 1 |
Recommended Standards
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Why CATO?
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