6-Methoxybenzo[d]isoxazole-3-carboxylic acid CAS 28691-48-7
| CAS No. | 28691-48-7 |
| Molecular Formula | C9H7NO4 |
| Molecular Weight | 193.16 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
6-Methoxybenzo[d]isoxazole-3-carboxylic acid (CAS 28691-48-7) is a high-purity analytical reference standard with the molecular formula C9H7NO4 and a molecular weight of 193.16 g/mol.
Based on its molecular formula C9H7NO4, 6-Methoxybenzo[d]isoxazole-3-carboxylic acid contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 193.16 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. 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).
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 | C9H7NO4 |
| Molecular Weight | 193.16 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) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1965 |
| Nitrogen Atoms | 1 |
Related Methoxybenzo Standards
- 4-Methoxybenzo[d]isoxazole-3-carboxylic acid (CAS 1352396-96-3)
- 7-Methoxybenzo[d]isoxazole-3-carboxylic acid (CAS 1935175-08-8)
- 2-(6-Methoxybenzo[d]isoxazol-3-yl)ethan-1-ol (CAS 57148-91-1)
- 2-Ethyl-6-methoxybenzo[d]isoxazol-3(2h)-one (CAS 2102412-86-0)
- 2-Methoxybenzo[d]thiazole-6-carbaldehyde (CAS 1368353-79-0)
- 5-Methoxybenzo[b]thiophene-3-carbaldehyde (CAS 123392-42-7)
- 4-Methoxybenzo[b]thiophene-3-carbaldehyde (CAS 42326-68-1)
- 6-Methoxybenzo[b]thiophene-3-carbaldehyde (CAS 896722-64-8)
Recommended Standards
- 6-Methoxy-2-nitrobenzofuran (CAS 36687-17-9)
- 6-Methoxyimidazo[1,2-b]pyridazine-2-carboxylic Acid (CAS 64068-09-3)
- 6-Methoxy-2-benzoxazolecarboxylic Acid (CAS 944898-55-9)
- 6-Methoxypyrido[3,4-d]pyrimidine-2,4-diol (CAS 769158-28-3)
- N-(5-Methylisoxazol-4-yl)cyclopropanecarboxamide (CAS 600699-38-5)
- 2,4,6-Tris(bromomethyl)-1,3,5-triazine (CAS 30361-99-0)
- Methyl 3-(1,3-dioxolan-2-yl)benzoate (CAS 124038-36-4)
- Ethosuximide impurity 9 (CAS CATO-C4X-26259)
- (3S,5R)-5-(Hydroxymethyl)pyrrolidin-3-ol (CAS 825644-11-9)
- Methadone Impurity N (CAS 6639-43-6)
- N-(2-(1H-Indol-3-yl)ethyl)-4-methoxybenzenesulfonamide (CAS 120823-45-2)
- 9H-Pyrrolo[2,3-c:5,4-c']dipyridine (CAS 77200-36-3)
- 9H-Fluorene-2-sulfonyl chloride (CAS 13354-17-1)
- Semaglutide impurity 46 (CAS CATO-C4X-222646)
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