4-Bromo-1-ethyl-3-nitro-1h-pyrazole CAS 70951-84-7
| CAS No. | 70951-84-7 |
| Molecular Formula | C5H6BrN3O2 |
| Molecular Weight | 220.02 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of 4-Bromo-1-ethyl-3-nitro-1h-pyrazole is closely related to an amide group, a carboxylic acid group, a hydroxyl group, an ether linkage, bromine substitution in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
4-Bromo-1-ethyl-3-nitro-1h-pyrazole (CAS 70951-84-7) is a high-purity analytical reference standard with the molecular formula C5H6BrN3O2 and a molecular weight of 220.02 g/mol.
The molecular framework of 4-Bromo-1-ethyl-3-nitro-1h-pyrazole (C5H6BrN3O2) is characterized by an amide group, a carboxylic acid group, a hydroxyl group, an ether linkage, bromine 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.
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
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 | C5H6BrN3O2 |
| Molecular Weight | 220.02 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 sealed and dry, 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; Hygroscopic; reseal immediately after opening; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1977 |
| Halogen Content | Br-containing |
| Nitrogen Atoms | 3 |
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Recommended Standards
- 4-Bromo-1,2-dimethyl-5-nitro-1H-imidazole (CAS 21431-58-3)
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- 5-Ethoxy-1H-indole-2-carbohydrazide (CAS 30464-76-7)
- (1-((1H-Indazol-3-yl)methyl)piperidin-4-yl)methanamine (CAS 1708379-91-2)
- 4-(Azetidin-3-yl)piperazine-1-sulfonamide (CAS 178312-21-5)
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- Gadobutrol Impurity 34 (CAS 2748309-13-7)
- 4-Bromo-3,6-dimethyl-2-(2,4,6-trimethoxyphenoxy)pyridine (CAS 351382-79-1)
- 6,7-Dichloro-4-oxo-1,4-dihydroquinoline-3-carboxylic acid (CAS 51726-82-0)
- 2-Chloro-6-ethoxy-3-phenylquinoline (CAS 1031928-18-3)
- 3-Bromo-8-chloroimidazo[1,2-a]pyridine-6-carbonitrile (CAS 1221791-70-3)
- Peptide Impurity 06 (CAS CATO-CPTD788806)
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