3-Bromo-5-chloro-1-vinyl-1H-pyrazole CAS 923036-01-5
| CAS No. | 923036-01-5 |
| Molecular Formula | C5H4BrClN2 |
| Molecular Weight | 207.46 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 207.46 g/mol gives 3-Bromo-5-chloro-1-vinyl-1H-pyrazole distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
3-Bromo-5-chloro-1-vinyl-1H-pyrazole (CAS 923036-01-5), molecular formula C5H4BrClN2 and molecular weight 207.46 g/mol, is a CATO reference standard with documented purity and traceability.
Based on its molecular formula C5H4BrClN2, 3-Bromo-5-chloro-1-vinyl-1H-pyrazole contains a nitrile group, chlorine/bromine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 207.46 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. 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 | C5H4BrClN2 |
| Molecular Weight | 207.46 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-like odor, faint amine-like odor, low volatility) |
| 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) | 4.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1987 |
| Halogen Content | Cl/Br-containing |
| Nitrogen Atoms | 2 |
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Recommended Standards
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- 3-Bromo-6-chloropyridin-2-amine (CAS 442127-50-6)
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- Sodium 3-methoxybenzenesulfinate (CAS 15898-41-6)
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