4-Bromo-1-ethyl-3-methyl-1H-pyrazole-5-carbonyl chloride CAS 175277-00-6
| CAS No. | 175277-00-6 |
| Molecular Formula | C7H8BrClN2O |
| Molecular Weight | 251.51 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
4-Bromo-1-ethyl-3-methyl-1H-pyrazole-5-carbonyl chloride (CAS 175277-00-6) is a high-purity analytical reference standard with the molecular formula C7H8BrClN2O and a molecular weight of 251.51 g/mol.
The molecular framework of 4-Bromo-1-ethyl-3-methyl-1H-pyrazole-5-carbonyl chloride (C7H8BrClN2O) is characterized by an amide group, a hydroxyl group, an ether linkage, chlorine/bromine substitution, an aromatic ring system. 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. 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).
As a certified reference material (CRM), 4-Bromo-1-ethyl-3-methyl-1H-pyrazole-5-carbonyl chloride 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 | C7H8BrClN2O |
| Molecular Weight | 251.51 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 |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2007 |
| Halogen Content | Cl/Br-containing |
| Nitrogen Atoms | 2 |
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