5-(4-Chloro-phenyl)-1-(2,4-dichloro-phenyl)-1h-pyrazole-3,4-dicarboxylic acid diethyl ester CAS 1206970-22-0
| CAS No. | 1206970-22-0 |
| Molecular Formula | C21H17Cl3N2O4 |
| Molecular Weight | 467.73 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 467.73 g/mol gives 5-(4-Chloro-phenyl)-1-(2,4-dichloro-phenyl)-1h-pyrazole-3,4-dicarboxylic acid diethyl ester distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
5-(4-Chloro-phenyl)-1-(2,4-dichloro-phenyl)-1h-pyrazole-3,4-dicarboxylic acid diethyl ester (CAS 1206970-22-0) is a high-purity analytical reference standard with the molecular formula C21H17Cl3N2O4 and a molecular weight of 467.73 g/mol.
The molecular framework of 5-(4-Chloro-phenyl)-1-(2,4-dichloro-phenyl)-1h-pyrazole-3,4-dicarboxylic acid diethyl ester (C21H17Cl3N2O4) is characterized by a flavonoid core, an amide group, a hydroxyl group, an ether linkage, chlorine 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.
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.
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 | C21H17Cl3N2O4 |
| Molecular Weight | 467.73 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor, low volatility) |
| Purity | 97%+ |
| Storage | Store in a cool place (≤25°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; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 13.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1990 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
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Recommended Standards
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