4,5-Dibromo-1-methyl-1H-pyrazole CAS 70951-86-9
| CAS No. | 70951-86-9 |
| Molecular Formula | C4H4Br2N2 |
| Molecular Weight | 239.90 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Structurally, 4,5-Dibromo-1-methyl-1H-pyrazole (C4H4Br2N2) contains a nitrile group, bromine substitution. The molecule exhibits a degree of unsaturation (DBE) of 3.0, corresponding to approximately 3 ring(s) or double-bond equivalent(s). With a molecular weight of 239.90 g/mol, it falls into the medium-molecular-weight range. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
4,5-Dibromo-1-methyl-1H-pyrazole (CAS 70951-86-9), molecular formula C4H4Br2N2 and molecular weight 239.90 g/mol, is a CATO reference standard with documented purity and traceability.
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), 4,5-Dibromo-1-methyl-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 | C4H4Br2N2 |
| Molecular Weight | 239.90 g/mol |
| Appearance | 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) | 3.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1977 |
| Halogen Content | Br-containing |
| Nitrogen Atoms | 2 |
Related Dibromo Standards
- 4,5-Dibromo-1-methylimidazole (CAS 1003-50-5)
- 3,5-Dibromo-1-methyl-1H-pyrazole (CAS 1361019-05-7)
- 2,4-Dibromo-1-methyl-1H-imidazole, 97% (CAS 53857-60-6)
- 2,5-Dibromo-1-methyl-1H-imidazole, 97% (CAS 53857-59-3)
- 2,5-Dibromo-4-methylimidazole (CAS 219814-29-6)
- 3,4-Dibromo-1-methyl-pyrazole (CAS 89607-14-7)
- 3,4-Dibromo-5-methylpyrazole (CAS 5932-19-4)
- 3,5-Dibromo-4-methyl-1H-pyrazole (CAS 60061-54-3)
Recommended Standards
- 4,5-Dibromo-2-methyl-1H-imidazole (CAS 4002-81-7)
- 3,5-Dibromopyridine-d3 (CAS 1219799-05-9)
- 2,2,2-Trichloro-1,1-Dimethylethyl Chloroformate 66270-36-8 TCBoc-chloride |A,|A,|A-Trichloro-tert-butoxycarbonyl chloride |A,|A,|A-Trichloro-tert-butyl chloroformate (CAS 66270-36-8)
- 1-Bromo-2,5-dichloro-3-methylbenzene (CAS 1000571-63-0)
- 3-(Difluoromethyl)-5-methoxy-4-methylpyridin-2-amine (CAS 1804366-76-4)
- Diethyl 2-methylenemalonate (CAS 3377-20-6)
- Sodium 2-acetamidomalonate (CAS 117976-12-2)
- 1-Methyl-4-(prop-1-yn-1-yl)benzene (CAS 2749-93-1)
- Methyl 7-bromo-1H-indole-2-carboxylate (CAS 1158503-82-2)
- Carprofen EP Impurity B (CAS 52263-68-0)
- 4-[(2,5-Dioxotetrahydro-1H-imidazol-4-yliden)methyl]phenyl 3-Chloro-2,2-dimethylpropanoate (CAS 245072-83-7)
- 2,5-Diamino-3-bromobenzonitrile (CAS 82997-65-7)
- 4-Bromo-6-chloroquinolin-2-amine (CAS 1136479-34-9)
- Neuropeptide S (rat) (CAS 412938-75-1)
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