4-Bromo-5-methyl-1H-pyrazole-3-carboxylic acid CAS 82231-52-5
| CAS No. | 82231-52-5 |
| Molecular Formula | C5H5BrN2O2 |
| Molecular Weight | 205.01 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
As a certified reference material (CRM), 4-Bromo-5-methyl-1H-pyrazole-3-carboxylic acid 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.
4-Bromo-5-methyl-1H-pyrazole-3-carboxylic acid (CAS 82231-52-5), molecular formula C5H5BrN2O2 and molecular weight 205.01 g/mol, is a CATO reference standard with documented purity and traceability.
Structurally, 4-Bromo-5-methyl-1H-pyrazole-3-carboxylic acid (C5H5BrN2O2) contains an amide group, a carboxylic acid group, a hydroxyl group, an ether linkage, bromine substitution. The molecule exhibits a degree of unsaturation (DBE) of 4.0, corresponding to approximately 4 ring(s) or double-bond equivalent(s). With a molecular weight of 205.01 g/mol, it falls into the medium-molecular-weight range. 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.
Physical & Chemical Properties
| Molecular Formula | C5H5BrN2O2 |
| Molecular Weight | 205.01 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 sealed and dry, 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; Hygroscopic; reseal immediately after opening; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1980 |
| Halogen Content | Br-containing |
| Nitrogen Atoms | 2 |
Related Bromo Standards
- 4-Bromo-1-methyl-1H-imidazole-2-carboxylic acid (CAS 1027134-70-8)
- 5-Bromo-2-methyl-1H-imidazole-4-carboxylic acid (CAS 1093261-50-7)
- 5-Bromo-1-methyl-1,4-dihydropyrazine-2,3-dione (CAS 1133433-93-8)
- 5-Bromo-3-hydroxy-1-methylpyrazin-2(1H)-one (CAS 1133573-50-8)
- 5-bromo-4-methyl-1H-imidazole-2-carboxylic acid (CAS 1171125-21-5)
- 2-(4-Bromo-1H-imidazol-1-yl)acetic acid (CAS 1211524-53-6)
- 5-Bromo-N-methyl-1H-1,2,4-triazole-3-carboxamide (CAS 1232793-93-9)
- Methyl 5-bromo-1H-pyrazole-3-carboxylate (CAS 1328893-17-9)
Recommended Standards
- 4-Bromo-5-methyl-1,2-dihydropyridazine-3,6-dione (CAS 732295-61-3)
- 5-(Bromomethyl)pyrimidine-2,4(1H,3H)-dione (CAS 4874-37-7)
- 4-Bromo-5-hydroxy-2-methyl-2H-pyridazin-3-one (CAS 64178-59-2)
- 5-Bromo-1-methyl-1H-pyrazole-4-carboxylic acid (CAS 54367-67-8)
- 1-((4-Fluorophenyl)sulfonyl)-1,2,3,4-tetrahydroquinolin-7-amine (CAS 927996-70-1)
- tert-Butyl 4-[(5-nitropyridin-2-yl)oxy]piperidine-1-carboxylate (CAS 346665-40-5)
- Mepitiostane (CAS 21362-69-6)
- 2-(Octahydro-1h-cyclopenta[b]pyridin-1-yl)ethan-1-amine (CAS 1485942-45-7)
- 2-[1-[(1,1-Dimethylethoxy)carbonyl]-3-pyrrolidinyl]-4-thiazolecarboxylic acid (CAS 1211585-39-5)
- 1,3-Bis(4-methoxyphenyl)imidazo[1,5-a]pyridine (CAS 906668-47-1)
- 6-Chloro-4-hydrazinyl-3-methylisoxazolo[5,4-b]pyridine (CAS 63523-62-6)
- Cresyl Violet (CAS 18472-89-4)
- 6-Iodo-[1,2,4]triazolo[4,3-a]pyridin-3(2h)-one (CAS 690258-19-6)
- Semaglutide impurity 197 (CAS CATO-C4X-2226197)
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