4-Bromo-1-(4-chlorophenyl)-1H-pyrazole CAS 885017-82-3
| CAS No. | 885017-82-3 |
| Molecular Formula | C9H6BrClN2 |
| Molecular Weight | 257.51 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 4-Bromo-1-(4-chlorophenyl)-1H-pyrazole.
4-Bromo-1-(4-chlorophenyl)-1H-pyrazole (CAS 885017-82-3) is a high-purity analytical reference standard with the molecular formula C9H6BrClN2 and a molecular weight of 257.51 g/mol.
The molecular framework of 4-Bromo-1-(4-chlorophenyl)-1H-pyrazole (C9H6BrClN2) is characterized by a nitrogen-containing heterocyclic scaffold, a nitrile group, chlorine/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. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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.
As a certified reference material (CRM), 4-Bromo-1-(4-chlorophenyl)-1H-pyrazole 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 | C9H6BrClN2 |
| Molecular Weight | 257.51 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) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1987 |
| Halogen Content | Cl/Br-containing |
| Nitrogen Atoms | 2 |
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- 6-Bromo-1-chloro-2-naphthol (CAS 102169-88-0)
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Recommended Standards
- 4-Bromo-1-(3-chlorophenyl)-1H-pyrazole (CAS 957034-94-5)
- 5-Bromo-4-chloronaphthalen-2-ol (CAS 2766210-87-9)
- 4-Bromo-1-(2-chlorophenyl)-1H-pyrazole (CAS 957063-04-6)
- 6-(Bromomethyl)-2-chloroquinoxaline (CAS 944925-02-4)
- P,P′-[5′-(4-Phosphonophenyl)[1,1′:3′,1′′-terphenyl]-4,4′′-diyl]bis[phosphonic acid] (CAS 1045720-71-5)
- Boc-His(3-Me)-OH (CAS 61070-22-2)
- 5-Azaindole-2-carbaldehyde (CAS 630395-95-8)
- 6-Amino-4-methylquinolin-2(1H)-one (CAS 90914-95-7)
- tert-Butyl 5,6-dimethoxy-1H-indole-2-carboxylate (CAS 1446512-80-6)
- (Z)-Ethyl-3-acetamido-but-2-enoate (CAS 23652-56-4)
- PBI 51 (CAS 130694-74-5)
- 1-(6-Methylpyridin-2-yl)piperidine-4-carbaldehyde (CAS 1251232-40-2)
- (2S)-2-(4-(3-(2,4-Diamino-6,7-dihydro-5H-cyclopenta[d]pyrimidin-5-yl)propyl)benzamido)pentanedioic acid (CAS 149325-95-1)
- Semaglutide impurity 199 (CAS CATO-C4X-2226199)
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