2-Chloro-7-methoxyquinoxaline CAS 55686-93-6
| CAS No. | 55686-93-6 |
| Molecular Formula | C9H7ClN2O |
| Molecular Weight | 194.62 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.
2-Chloro-7-methoxyquinoxaline (CAS 55686-93-6), molecular formula C9H7ClN2O and molecular weight 194.62 g/mol, is a CATO reference standard with documented purity and traceability.
The molecular framework of 2-Chloro-7-methoxyquinoxaline (C9H7ClN2O) is characterized by a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, chlorine substitution. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
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 | C9H7ClN2O |
| Molecular Weight | 194.62 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-like odor, faint amine-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1972 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
Related Chloro Standards
- 5-Chloro-6-methyl-7H-pyrrolo[2,3-b]pyridine-3-carbaldehyde (CAS 1000340-13-5)
- 4-Chloro-7-methyl-1H-indazole-3-carbaldehyde (CAS 1000340-67-9)
- 6-(4-Chloro-1H-pyrazol-1-yl)pyridin-3-amine (CAS 1006961-40-5)
- 4-Chloro-1-methyl-1,8-naphthyridin-2(1H)-one (CAS 1009360-86-4)
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Recommended Standards
- 2-chloro-7-methoxyquinazoline (CAS 953039-15-1)
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- 2-Chloro-6-methyl-4H-pyrido[1,2-a]pyrimidin-4-one (CAS 38326-29-3)
- 2-Chloro-7-methylquinazolin-4(3H)-one (CAS 62484-41-7)
- (E)-3-(6-Amino-3-pyridyl)acrylic Acid (CAS 167837-43-6)
- 2,4-Dichloro-6,7-dimethyl-7H-pyrrolo[2,3-d]pyrimidine (CAS 1638759-50-8)
- 5-Chloro-2-(cyclopentylmethoxy)aniline (CAS 946727-66-8)
- Telmisartan Impurity 68 (CAS CATO-C4X-135968)
- (E)-3-(2-Cyanophenyl)-N-methoxy-N-methylacrylamide (CAS 1220889-33-7)
- (R)-tert-Butyl 3-((S)-2-amino-N,3-dimethylbutanamido)pyrrolidine-1-carboxylate (CAS 1401665-05-1)
- 4-Fluoro-2-bromophenol methyl cyclopropyl ether (CAS 1156170-01-2)
- (4-(1,3-Dioxolan-2-yl)phenyl)(4-chlorophenyl)methanone (CAS 780776-35-4)
- (S)-3-(1-Aminoethyl)-4,8-dichloro-2-phenylisoquinolin-1(2H)-one (CAS 2055766-86-2)
- D-Pro31-Tirzepatide (CAS CATO-CPTD788905)
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