5-bromo-3-chloro-1H-pyrazin-2-one CAS 21943-17-9
| CAS No. | 21943-17-9 |
| Molecular Formula | C4H6BrClN2O |
| Molecular Weight | 213.46 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 213.46 g/mol gives 5-bromo-3-chloro-1H-pyrazin-2-one distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
5-bromo-3-chloro-1H-pyrazin-2-one (CAS 21943-17-9) is a high-purity analytical reference standard with the molecular formula C4H6BrClN2O and a molecular weight of 213.46 g/mol.
5-bromo-3-chloro-1H-pyrazin-2-one (C4H6BrClN2O) contains an amide group, a hydroxyl group, an ether linkage, chlorine/bromine substitution. Halogen substitution raises its density and boiling point; these physicochemical properties determine the optimal preparation and storage of its standard solutions. 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.
As a certified reference material (CRM), 5-bromo-3-chloro-1H-pyrazin-2-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 | C4H6BrClN2O |
| Molecular Weight | 213.46 g/mol |
| 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 | Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 2.0 |
| CAS Registry Year (est.) | 1963 |
| Halogen Content | Cl/Br-containing |
| Nitrogen Atoms | 2 |
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