6-Chloro-1H-imidazo[4,5-b]pyridine CAS 21422-66-2
| CAS No. | 21422-66-2 |
| Molecular Formula | C6H4ClN3 |
| Molecular Weight | 153.57 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Based on its molecular formula C6H4ClN3, 6-Chloro-1H-imidazo[4,5-b]pyridine contains a nitrile group, chlorine substitution, an aromatic ring system; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 153.57 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).
6-Chloro-1H-imidazo[4,5-b]pyridine (CAS 21422-66-2) is a high-purity analytical reference standard with the molecular formula C6H4ClN3 and a molecular weight of 153.57 g/mol.
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.
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 | C6H4ClN3 |
| Molecular Weight | 153.57 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) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1963 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 3 |
Related Chloro Standards
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Recommended Standards
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- Ethyl 1-acetamidocyclopent-3-enecarboxylate (CAS 204058-12-8)
- tert-Butyl 2-(aminomethyl)-6,7-dihydrofuro[3,2-c]pyridine-5(4H)-carboxylate (CAS 1707365-17-0)
- 5-Chloro-4-((phenylsulfonyl)methyl)-1,2,3-thiadiazole (CAS 338795-05-4)
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