4-Bromo-5-(hydroxymethyl)-1-methyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one CAS 81122-69-2
| CAS No. | 81122-69-2 |
| Molecular Formula | C11H11BrN2O2 |
| Molecular Weight | 283.12 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The molecular framework of 4-Bromo-5-(hydroxymethyl)-1-methyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one (C11H11BrN2O2) is characterized by a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, bromine substitution. In reversed-phase chromatography, its retention is governed primarily by its high hydrophobicity (logP), 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.
4-Bromo-5-(hydroxymethyl)-1-methyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one (CAS 81122-69-2), molecular formula C11H11BrN2O2 and molecular weight 283.12 g/mol, is a CATO reference standard with documented purity and traceability.
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
As a certified reference material (CRM), 4-Bromo-5-(hydroxymethyl)-1-methyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one 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.
Physical & Chemical Properties
| Molecular Formula | C11H11BrN2O2 |
| Molecular Weight | 283.12 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-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) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1980 |
| Halogen Content | Br-containing |
| Nitrogen Atoms | 2 |
Related Bromo Standards
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Recommended Standards
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- Cytochalasin H (CAS 53760-19-3)
- 1,2-Dichloro-1,2,3,3,4,4,5,5,6,6-decafluorocyclohexane (CAS 336-14-1)
- (S)-1-(Dimethoxymethyl)-2-(methoxymethyl)pyrrolidine (CAS 73473-30-0)
- 2-Bromo-3-(difluoromethoxy)-6-iodopyridine (CAS 857295-23-9)
- 1-Propyl-6-(trifluoromethyl)-1h-1,3-benzodiazole-2-thiol (CAS 746608-47-9)
- 1-(4-(2-Hydroxyethyl)piperazin-1-yl)-2-isopropoxyethan-1-one (CAS 1424529-21-4)
- (S)-6-Fluoro-2-methyl-1,2,3,4-tetrahydroquinoline (CAS 199186-68-0)
- 1-(4-(5-(1-Aminoethyl)-4-methylpyridin-2-yl)piperazin-1-yl)ethanone (CAS 1355214-63-9)
- (S)-2-(2,4-difluorophenyl)pyrrolidine (CAS 1217667-72-5)
- Semaglutide impurity 56 (CAS CATO-C4X-222656)
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