5-Methoxy-2-methylbenzoxazole CAS 5676-57-3
| CAS No. | 5676-57-3 |
| Molecular Formula | C9H9NO2 |
| Molecular Weight | 163.17 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
5-Methoxy-2-methylbenzoxazole (CAS 5676-57-3) is a high-purity analytical reference standard with the molecular formula C9H9NO2 and a molecular weight of 163.17 g/mol.
5-Methoxy-2-methylbenzoxazole (C9H9NO2) contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage. 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).
As a certified reference material (CRM), 5-Methoxy-2-methylbenzoxazole 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 | C9H9NO2 |
| Molecular Weight | 163.17 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 |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1958 |
| Nitrogen Atoms | 1 |
Related Methoxy Standards
- 5-methoxy-1H-indol-2-ol (CAS 1032268-22-6)
- 7-Methoxy-1H-indol-5-ol (CAS 1167056-30-5)
- 2-Methoxy-6,7-dihydro-5H-cyclopenta[b]pyridin-5-one (CAS 1196154-17-2)
- 7-Methoxy-1H-indol-6-ol (CAS 123229-76-5)
- 4-Methoxy-3-methylbenzo[d]isoxazole (CAS 1394900-05-0)
- 5-Methoxy-3-methylbenzo[d]isoxazole (CAS 145508-90-3)
- 7-Methoxy-3-methylbenzo[d]isoxazole (CAS 145508-91-4)
- 7-Methoxy-1H-indol-4-ol (CAS 146099-11-8)
Recommended Standards
- 5-Methoxy-1H-indol-4-ol (CAS 49635-16-7)
- 5-Methoxy-3-methylbenzo[c]isoxazole (CAS 53967-86-5)
- 5-Hydroxy-6-methylindolin-2-one (CAS 439911-02-1)
- 5-Methoxyoxindole (CAS 7699-18-5)
- 1-methylimidazol-4-amine (CAS 79578-98-6)
- 2-Chloro-3-[2-(3-cyanophenyl)-1-oxoethyl]pyridine (CAS 884504-82-9)
- 4-Nitrophenanthrene (CAS 82064-15-1)
- (1S,2S)-N,N-Bis[2-(diphenylphosphino)benzyl]cyclohexane-1,2-diamine (CAS 174677-83-9)
- 3-chloro-N-(4-chloro-3-methoxyphenyl)propanamide (CAS 915920-71-7)
- 2-(2-methyl-2,3-dihydro-1H-indol-1-yl)ethanamine dihydrochloride (CAS 1171622-85-7)
- 4-Fluoro-2-methyl-benzenesulfonyl fluoride (CAS 154641-99-3)
- 2,2,5-Trimethyl-1,3-dioxane-5-carbaldehyde (CAS 138517-53-0)
- 5-Cyclopropoxy-2-isopropylisonicotinaldehyde (CAS 1243470-94-1)
- Semaglutide impurity 266 (CAS CATO-C4X-2226266)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com