4-Bromo-5-methyl-1H-pyrazole CAS 1076223-98-7
| CAS No. | 1076223-98-7 |
| Molecular Formula | C4H5BrN2 |
| Molecular Weight | 161.00 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.
CATO supplies 4-Bromo-5-methyl-1H-pyrazole (CAS 1076223-98-7), a certified reference material (molecular formula C4H5BrN2, MW 161.00 g/mol) for analytical method development and quality control.
The molecular framework of 4-Bromo-5-methyl-1H-pyrazole (C4H5BrN2) 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.
Physical & Chemical Properties
| Molecular Formula | C4H5BrN2 |
| Molecular Weight | 161.00 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.) | 1988 |
| Halogen Content | Br-containing |
| Nitrogen Atoms | 2 |
Related Bromo Standards
- 2-Bromo-2-cyclopentenone (CAS 10481-34-2)
- 2-Bromo-5-methylfuran (CAS 123837-09-2)
- 4-Bromo-3-methylpyrazole (CAS 13808-64-5)
- 3-Bromo-1-methyl-1<I>H</I>-pyrazole (CAS 151049-87-5)
- 4-Bromo-1-methyl-1H-pyrazole (CAS 15803-02-8)
- 4-Bromo-5-methylimidazole (CAS 15813-08-8)
- 4-Bromo-2-methyl-1H-imidazole (CAS 16265-11-5)
- 3-Bromo-4-methylfuran (CAS 176042-58-3)
Recommended Standards
- 3-(Bromomethyl)-1H-pyrazole (CAS 102846-12-8)
- 1-(Bromomethyl)-1H-pyrazole (CAS 1256561-87-1)
- 4,5-Dichloro-1H-pyrrole-2-carbonitrile (CAS 51147-99-0)
- 2-fluoro-6-methylpyridine-3-boronic acid (CAS 906744-85-2)
- 1-(4-Fluorophenyl)-5-methyl-1H-pyrazole-4-carbaldehyde (CAS 423768-41-6)
- 2-((Trifluoromethyl)thio)isonicotinonitrile (CAS 1204235-06-2)
- 5-Ethynyl-2-(piperidin-1-yl)pyrimidine (CAS 1196156-92-9)
- 1223748-52-4 2515AD 3-(7-Cyano-1H-indol-3-yl)propanoic acid C12H10N2O2 (CAS 1223748-52-4)
- tert-Butyl ((1H-1,2,4-triazol-5-yl)methyl)carbamate (CAS 311349-66-3)
- Ethyl 6-((tert-butoxycarbonyl)amino)-2,3-difluorobenzoate (CAS 1092513-08-0)
- N,N-Dimethyl-5-nitro-1-phenyl-1H-benzo[d]imidazol-2-amine (CAS 832102-66-6)
- N-(3-methylpentan-2-yl)cyclohexanamine (CAS 1042613-79-5)
- 7-Bromo-4-hydrazinyl-2-methylquinoline hydrochloride (CAS 1172816-69-1)
- Vasonatrin Peptide (VNP) trifluoroacetate salt (CAS 141676-35-9)
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