4-Bromo-3,5-dimethylpyrazole CAS 3398-16-1
| CAS No. | 3398-16-1 |
| Molecular Formula | C5H7BrN2 |
| Molecular Weight | 175.03 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
4-Bromo-3,5-dimethylpyrazole (CAS 3398-16-1) is a high-purity analytical reference standard with the molecular formula C5H7BrN2 and a molecular weight of 175.03 g/mol.
The molecular framework of 4-Bromo-3,5-dimethylpyrazole (C5H7BrN2) is characterized by a nitrile group, 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. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
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.
Physical & Chemical Properties
| Molecular Formula | C5H7BrN2 |
| Molecular Weight | 175.03 g/mol |
| Appearance | White to pale yellow crystalline powder. (slight halide-like odor, faint amine-like odor) |
| Purity | >95% |
| 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) | 3.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1957 |
| Halogen Content | Br-containing |
| Nitrogen Atoms | 2 |
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Recommended Standards
- 4-Bromo-1-ethylpyrazole (CAS 71229-85-1)
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- 5-Bromo-1,2-dimethylimidazole (CAS 24134-09-6)
- tert-Butyl 4-bromo-2-(2,2-difluoroethyl)benzylcarbamate (CAS 2388489-07-2)
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- 2-(4-Amino-2-ethoxyphenyl)pthalimide (CAS 106981-52-6)
- (2,2-dimethyl-1,3-dioxolan-4-yl)methyl 4-methylbenzenesulfonate (CAS 7305-59-1)
- Methyl 3-(2-methyl-1h-imidazol-1-yl)propanoate (CAS 457957-92-5)
- Ethyl 3-cyano-3-(6-methoxy-3-nitropyridin-2-yl)propanoate (CAS 1060717-82-9)
- 1,5-Dichloro-2,4-ditrifluoromethanesulfonylbenzene (CAS 321686-31-1)
- 2-Furancarbonitrile, 3-fluoro- (CAS 2122319-19-9)
- Semaglutide impurity 229 (CAS CATO-C4X-2226229)
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