4-Azabenzimidazole
Synonym(s):1H-Imidazo[4,5-b]pyridine
- CAS NO.：273-21-2
- Empirical Formula: C6H5N3
- Molecular Weight: 119.12
- MDL number: MFCD00005579
- EINECS: 205-987-3
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-05-28 03:30:31
What is 4-Azabenzimidazole?
Chemical properties
yellow to light brown powder
The Uses of 4-Azabenzimidazole
4-Azabenzimidazole is used in the preparation of imidazo[4,5-b]pyridine 4-oxide. It is also used as a reagent to prepare benzoylmethyl-substituted azoles which are inhibitors of nitric oxide synthase with antioxidant properties.
Definition
ChEBI: The [4,5-b]-fused isomer of imidazopyridine.
Properties of 4-Azabenzimidazole
| Melting point: | 148-151 °C (lit.) |
| Boiling point: | 140-150°C/0.1mm |
| Density | 1.2058 (rough estimate) |
| refractive index | 1.5589 (estimate) |
| Flash point: | 140-150°C/0.1mm |
| storage temp. | Inert atmosphere,Room Temperature |
| solubility | Soluble in dimethylformamide. |
| pka | 8.46±0.20(Predicted) |
| BRN | 2600 |
| CAS DataBase Reference | 273-21-2(CAS DataBase Reference) |
| EPA Substance Registry System | 1H-Imidazo[4,5-b]pyridine (273-21-2) |
Safety information for 4-Azabenzimidazole
| Signal word | Warning |
| Pictogram(s) |
 Exclamation Mark Irritant GHS07 |
| GHS Hazard Statements |
H302:Acute toxicity,oral H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation |
| Precautionary Statement Codes |
P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. |
Computed Descriptors for 4-Azabenzimidazole
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