Methyl 7-chloro-3-oxo-3,4-dihydroquinoxaline-2-carboxylate CAS 221167-38-0
| CAS No. | 221167-38-0 |
| Molecular Formula | C10H7ClN2O3 |
| Molecular Weight | 238.63 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
CATO supplies Methyl 7-chloro-3-oxo-3,4-dihydroquinoxaline-2-carboxylate (CAS 221167-38-0), a certified reference material (molecular formula C10H7ClN2O3, MW 238.63 g/mol) for analytical method development and quality control.
Based on its molecular formula C10H7ClN2O3, Methyl 7-chloro-3-oxo-3,4-dihydroquinoxaline-2-carboxylate contains a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, chlorine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 238.63 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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.
Physical & Chemical Properties
| Molecular Formula | C10H7ClN2O3 |
| Molecular Weight | 238.63 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor, faint amine-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry, keep tightly closed to prevent evaporation |
| 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; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2020 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
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Recommended Standards
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- 4-(1-Methyl-1h-imidazol-5-yl)benzaldehyde (CAS 1333127-94-8)
- CAS 251459-09-3 (CAS 251459-09-3)
- (3-(3,5-Dimethylphenyl)isoxazol-5-yl)methanamine (CAS 885273-62-1)
- Benzyl 3-cyanopyrrolidine-1-carboxylate (CAS 188846-99-3)
- 3-Cyano-4-methylpyridine (CAS 5444-01-9)
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- Ethyl 6-chloro-2-(trifluoromethyl)nicotinate (CAS 261635-82-9)
- Semaglutide impurity 276 (CAS CATO-C4X-2226276)
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