Methyl 6-bromo-3-oxo-3,4-dihydropyrazine-2-carboxylate CAS 21874-61-3
| CAS No. | 21874-61-3 |
| Molecular Formula | C6H5BrN2O3 |
| Molecular Weight | 233.02 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
Methyl 6-bromo-3-oxo-3,4-dihydropyrazine-2-carboxylate (CAS 21874-61-3) is a high-purity analytical reference standard with the molecular formula C6H5BrN2O3 and a molecular weight of 233.02 g/mol.
Based on its molecular formula C6H5BrN2O3, Methyl 6-bromo-3-oxo-3,4-dihydropyrazine-2-carboxylate contains an amide group, a carboxylic acid group, a hydroxyl group, an ether linkage, bromine substitution, an aromatic ring system; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 233.02 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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 | C6H5BrN2O3 |
| Molecular Weight | 233.02 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 methanol, ethanol, DMSO, water |
| 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) | 5.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1963 |
| Halogen Content | Br-containing |
| Nitrogen Atoms | 2 |
Related Methyl Standards
- Methyl 5-bromo-2-formylfuran-3-carboxylate (CAS 1006598-64-6)
- 4-Bromo-6-methyl-2-nitropyridin-3-ol (CAS 1022250-67-4)
- 2-Bromo-4,6-dihydroxybenzoic acid (CAS 1037751-00-0)
- 3-Bromo-4-methyl-5-nitro-2-pyridinone (CAS 1049706-72-0)
- 3-Bromo-4-methyl-5-nitropyridin-2(3H)-one (CAS 1049706-72-2)
- 6-Bromo-3-hydroxy-4-methyl-2-nitropyridine (CAS 1303587-93-0)
- 2-Bromo-3-methoxy-5-nitropyridine (CAS 1353101-84-4)
- 5-Bromo-3-methoxy-2-nitropyridine (CAS 152684-26-9)
Recommended Standards
- Methyl 5-bromo-2-hydroxypyrimidine-4-carboxylate (CAS 71933-03-4)
- Pyridine, 2-bromo-5-methyl-4-nitro-, 1-oxide (CAS 60323-98-0)
- Methyl 4-bromo-5-formylfuran-2-carboxylate (CAS 441016-56-4)
- 2-Bromo-4-fluoro-5-methylbenzoic acid (CAS 1003709-39-4)
- 2-{[(4-chlorophenyl)methyl]amino}ethan-1-ol (CAS 40172-04-1)
- 2-(4-nitro-1h-pyraZol-1-yl)acetohydrazide (CAS 514800-70-5)
- 4-(Cyclopropylmethoxy)aniline hydrochloride (CAS 1158573-73-9)
- 2-Homomorpholinecarboxylic Acid Hydrochloride (CAS 1186663-62-6)
- Benzyl 1-(fluoromethyl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)cyclohex-3-ene-1-carboxylate (CAS 1818868-51-7)
- allo-Tetrahydro cortisone (CAS 547-77-3)
- 1-(4-Chlorophenyl)-1,5-dihydro-4-(4-morpholinyl)-2H-imidazol-2-one (CAS 188116-07-6)
- 4-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)-1,8-naphthyridine (CAS 1627721-94-1)
- (3-(N-Isopropyl-N-(4-methoxybenzyl)sulfamoyl)phenyl)boronic acid (CAS 1217501-23-9)
- Peptide YY (3-36) (canine, mouse, porcine, rat) trifluoroacetate salt (CAS 126339-09-1)
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