4-Bromo-3-methylpyridazine (hydrobromide) CAS 2751611-27-3
| CAS No. | 2751611-27-3 |
| Molecular Formula | C5H5BrN2 |
| Molecular Weight | N/A |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
4-Bromo-3-methylpyridazine (hydrobromide) (CAS 2751611-27-3) is a high-purity analytical reference standard with the molecular formula C5H5BrN2HBr and a molecular weight of 253.92 g/mol.
The molecular framework of 4-Bromo-3-methylpyridazine (hydrobromide) (C5H5BrN2HBr) 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. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
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 | C5H5BrN2 HBr |
| Molecular Weight | 253.92 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.) | 2002 |
| Halogen Content | Br-containing |
| Nitrogen Atoms | 2 |
Related Bromo Standards
- 4,9-Bis(5-bromo-2-thienyl)-6,7-bis[4-[(2-ethylhexyl)oxy]phenyl][1,2,5]thiadiazolo[3,4-g]quinoxaline (CAS 1000000-25-8)
- 14-Bromo-1-tetradecyne (CAS 1000014-24-3)
- 8-Bromo-6-chloro-imidazo[1,2-a]pyridine-2-carboxylic acid (CAS 1000017-98-0)
- ethyl 3-bromo-5-chloroimidazo[1,2-a]pyridine-2-carboxylate (CAS 1000018-03-0)
- 5-bromo-1-methyl-1H-indazol-3-amine (CAS 1000018-06-3)
- 5-Bromo-2-methyl-4-methylsulfonylphenylhydrazine (CAS 1000018-33-6)
- 1-[(5-Bromo-2-methyl-4-methylsulfonyl)phenyl]-piperidine-4-carboxamide (CAS 1000018-34-7)
- 1-[(5-Bromo-2-methyl-4-methylsulfonyl)phenyl]-piperazine (CAS 1000018-35-8)
Recommended Standards
- 4-(2,6-Dichlorophenyl)-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarbonitrile (CAS 180888-11-3)
- Formylproline (CAS 67985-73-3)
- o-(Naphthalen-1-ylmethyl)hydroxylamine (CAS 54484-68-3)
- Ethyl 3-hydroxy-6-phenylpyridazine-4-carboxylate (CAS 34753-27-0)
- 5-(Propan-2-yl)pyridin-3-ol (CAS 1243280-48-9)
- Olopatadine Impurity 34 HCl (CAS CATO-C4X-171834)
- 5-Ethynylindole (CAS 889108-48-9)
- Lithium trihydroxy(pyrazin-2-yl)boranuide (CAS 1393823-00-1)
- Ethyl 5-(2,4-difluorophenyl)-5-oxopentanoate (CAS 898753-08-7)
- Semaglutide impurity 203 (CAS CATO-C4X-2226203)
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