5-(2-Bromoethyl) 3-ethyl 3H-pyrazole-3,5-dicarboxylate CAS 88202-93-1
| CAS No. | 88202-93-1 |
| Molecular Formula | C9H11BrN2O4 |
| Molecular Weight | 291.10 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.
5-(2-Bromoethyl) 3-ethyl 3H-pyrazole-3,5-dicarboxylate (CAS 88202-93-1), molecular formula C9H11BrN2O4 and molecular weight 291.10 g/mol, is a CATO reference standard with documented purity and traceability.
The molecular framework of 5-(2-Bromoethyl) 3-ethyl 3H-pyrazole-3,5-dicarboxylate (C9H11BrN2O4) is characterized by a nitrogen-containing heterocyclic scaffold, an amide 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. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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 | C9H11BrN2O4 |
| Molecular Weight | 291.10 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 methanol, ethanol, DMSO |
| 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) | 5.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1982 |
| Halogen Content | Br-containing |
| Nitrogen Atoms | 2 |
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- 7,8-Difluoroquinolin-4-amine (CAS 1189107-49-0)
- 4-Bromo-N-(3-cyano-5,6-dihydro-4H-cyclopenta[b]thiophen-2-yl)benzamide (CAS 321945-30-6)
- N-(2-Phenylethyl)-1,3-benzothiazol-2-amine (CAS 439215-15-3)
- Salvinolone (CAS 120278-22-0)
- 6-Bromo-4-chloro-3-iodo-1H-indazole (CAS 887568-16-3)
- (3,4-Dichloro-phenyl)-ethyl-amine (CAS 17847-40-4)
- 1-[(4’-Chloro-5,5-dimethyl-3,4,5,6-tetrahydro-2-biphenylyl)methyl]piperazine (CAS 1228780-72-0)
- Semaglutide impurity 44 (CAS CATO-C4X-222644)
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