4-Bromo-1-methylpyrazole-3-carbonitrile CAS 287922-71-8
| CAS No. | 287922-71-8 |
| Molecular Formula | C5H4BrN3 |
| Molecular Weight | 186.01 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 186.01 g/mol gives 4-Bromo-1-methylpyrazole-3-carbonitrile distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
4-Bromo-1-methylpyrazole-3-carbonitrile (CAS 287922-71-8), molecular formula C5H4BrN3 and molecular weight 186.01 g/mol, is a CATO reference standard with documented purity and traceability.
4-Bromo-1-methylpyrazole-3-carbonitrile (C5H4BrN3) contains a nitrile group, bromine substitution. Halogen substitution raises its density and boiling point; these physicochemical properties determine the optimal preparation and storage of its standard solutions. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
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 | C5H4BrN3 |
| Molecular Weight | 186.01 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 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) | 5.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 2025 |
| Halogen Content | Br-containing |
| Nitrogen Atoms | 3 |
Related Bromo Standards
- 2-Bromo-4-methyl-1H-imidazole-5-carbonitrile (CAS 113444-53-4)
- 5-Bromo-1-methylpyrazole-4-carbonitrile (CAS 1269293-80-2)
- 4-Bromo-5-methylfuran-2-carbonitrile (CAS 1399661-99-4)
- 6-Bromo-3-pyridinecarboxaldehyde (CAS 149806-06-4)
- 5-Bromo-1-methyl-1H-imidazole-4-carbonitrile (CAS 1669415-69-3)
- 3-Bromo-1-methylpyrazole-4-carbonitrile (CAS 1703808-62-1)
- 6-bromo-1H-pyrazolo[1,5-a]imidazole (CAS 1784509-28-9)
- 1-Bromo-4-nitrosobenzene (CAS 3623-23-2)
Recommended Standards
- 3-Fluoro-5-(methylthio)phenylboronic acid (CAS 2121513-60-6)
- 4-Fluoro-2-(methylthio)phenylboronic acid (CAS 861931-38-6)
- 3-Bromo-2-formylpyridine (CAS 405174-97-2)
- 6-bromo-5H-imidazo[1,2-b]pyrazole (CAS 2866420-91-7)
- 1-(4-((6-Methoxyquinolin-8-yl)amino)butyl)guanidine (CAS 88755-57-1)
- (1-(Azetidin-3-yl)-1H-1,2,3-triazol-4-yl)methanol hydrochloride (CAS 1864063-28-4)
- 3-Bromo-5-hydrazinylpyridine dihydrochloride (CAS 1427195-27-4)
- 1,4-Dioxaspiro[4.4]nonan-2-ylmethanol (CAS 19837-64-0)
- 2-(3,4-Dimethoxyphenyl)-2-methylpropanal (CAS 717105-57-2)
- 4-Bromo-3-(bromomethyl)isothiazole (CAS 4576-96-9)
- 7,8-Difluoro-2-methylquinolin-3-ol (CAS 1314012-50-4)
- 3-Chloro-2-{[1-(1H-pyrazol-5-yl)ethyl]sulfanyl}-5-(trifluoromethyl)pyridine (CAS 321534-64-9)
- THP-PEG8-OH (CAS 658858-65-2)
- D-Ala28-Tirzepatide (CAS CATO-CPTD788906)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com