1-Ethyl-5-nitro-1H-indazole CAS 5228-51-3
| CAS No. | 5228-51-3 |
| Molecular Formula | C9H9N3O2 |
| Molecular Weight | 191.19 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including 1-Ethyl-5-nitro-1H-indazole.
1-Ethyl-5-nitro-1H-indazole (CAS 5228-51-3) is a high-purity analytical reference standard with the molecular formula C9H9N3O2 and a molecular weight of 191.19 g/mol.
Based on its molecular formula C9H9N3O2, 1-Ethyl-5-nitro-1H-indazole contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 191.19 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).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
As a certified reference material (CRM), 1-Ethyl-5-nitro-1H-indazole 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 | C9H9N3O2 |
| Molecular Weight | 191.19 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, keep sealed and dry |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1958 |
| Nitrogen Atoms | 3 |
Related Ethyl Standards
- 2-Ethyl-4-nitro-1H-benzo[d]imidazole (CAS 101236-92-4)
- 2-Methyl-2-(5-nitro-2-pyridinyl)propanenitrile (CAS 1256633-31-4)
- (7-Nitro-1H-indol-3-yl)methanamine (CAS 1360936-75-9)
- 1-(4-Nitro-1h-indol-3-yl)methanamine (CAS 153310-50-0)
- 2-Methyl-8-nitro-1,4-dihydroquinoxaline (CAS 1823888-40-9)
- 1-Ethyl-4-nitro-1H-benzo[d]imidazole (CAS 31419-70-2)
- 1-Ethyl-5-nitro-1H-benzo[d]imidazole (CAS 90349-15-8)
- 1-Ethyl-6-nitro-1H-benzo[d]imidazole (CAS 90349-16-9)
Recommended Standards
- 1H-benzimidazole-7-carboxylic acid, 2-amino-1-methyl- (CAS 945024-80-6)
- 1-Ethyl-1h-pyrazolo[3,4-b]pyridine-5-carboxylic acid (CAS 926207-75-2)
- 1H-pyrazolo[3,4-c]pyridine-7-carboxylic acid, ethyl ester (CAS 945840-81-3)
- 1-Ethyl-1H-benzo[d][1,2,3]triazole-5-carboxylic acid (CAS 691363-31-2)
- 3-Amino-2-(2-chlorophenyl)pyrido[2,3-d]pyrimidin-4(3H)-one (CAS 1363405-20-2)
- 4-Bromo-N-(pyridin-2-yl)naphthalene-1-sulfonamide (CAS 313402-60-7)
- Tert-butyl (R)-6,6-difluoro-2-methyl-1,4-diazepane-1-carboxylate (CAS 2166191-17-7)
- 2',5'-Diethoxybenzanilide (CAS 92-22-8)
- 1-(thiophen-3-ylmethyl)-1H-pyrazol-3-amine (CAS 1183247-90-6)
- Chloropentaammineruthenium(III) chloride (CAS 18532-87-1)
- 2-(3-Ethylpiperidin-1-yl)-2-methylpropan-1-amine (CAS 1156659-65-2)
- 2-{[(5-bromo-1,3-thiazol-2-yl)carbamoyl]methoxy}acetic acid (CAS 1248470-13-4)
- 2-(5-Methyl-4-oxo-4H-imidazol-2-yl)nicotinic acid (CAS 813430-36-3)
- Des-Asp15-Tirzepatide (CAS CATO-CPTD788958)
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