4-(2-bromoethynyl)-1-methyl-pyrazole CAS 2737342-90-2
| CAS No. | 2737342-90-2 |
| Molecular Formula | C6H9BrN2 |
| Molecular Weight | 189.05 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 189.05 g/mol gives 4-(2-bromoethynyl)-1-methyl-pyrazole distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
4-(2-bromoethynyl)-1-methyl-pyrazole (CAS 2737342-90-2) is a high-purity analytical reference standard with the molecular formula C6H9BrN2 and a molecular weight of 189.05 g/mol.
The molecular framework of 4-(2-bromoethynyl)-1-methyl-pyrazole (C6H9BrN2) 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. 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 | C6H9BrN2 |
| Molecular Weight | 189.05 g/mol |
| Appearance | 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 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.) | 2002 |
| Halogen Content | Br-containing |
| Nitrogen Atoms | 2 |
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- 3-(Bromoethynyl)pyridine (CAS 218431-38-0)
- 1-(Bromoethynyl)-2-fluorobenzene (CAS 1246224-44-1)
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- 1-(Bromoethynyl)-4-chlorobenzene (CAS 33491-03-1)
Recommended Standards
- 3-Bromo-4-isopropyl-1H-pyrazole (CAS 2386776-09-4)
- 4-bromo-1-ethyl-3-methyl-1h-pyraZole (CAS 519018-28-1)
- 3-(Bromomethyl)-1,5-dimethyl-1H-pyrazole (CAS 864550-79-8)
- 4-Bromo-1-isopropyl-1H-imidazole (CAS 623577-60-6)
- 2-(2,5-Difluorophenyl)-2-(methylamino)ethan-1-ol (CAS 1184681-47-7)
- 3-BRomo-5-(fluoromethyl)pyridine (CAS 1552638-59-1)
- 1-Boc-3-[2-Methanesulfonyl-5-(3-methylisoxazol-5-yl)pyrimidin-4-yl]piperidine (CAS 1017793-03-1)
- 6-(Trifluoromethyl)-1H-imidazo[4,5-b]pyridine-2-carbaldehyde (CAS 944904-88-5)
- 6-Fluoro-2-hydroxyquinoline-3-carboxylic acid (CAS 938378-09-7)
- 3-Bromo-5-(m-tolyloxy)pyridine (CAS 28231-75-6)
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