Methyl 3-bromo-2-oxo-2H-pyran-5-carboxylate CAS 42933-07-3
| CAS No. | 42933-07-3 |
| Molecular Formula | C7H5BrO4 |
| Molecular Weight | 233.02 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 233.02 g/mol gives Methyl 3-bromo-2-oxo-2H-pyran-5-carboxylate distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
Methyl 3-bromo-2-oxo-2H-pyran-5-carboxylate (CAS 42933-07-3), molecular formula C7H5BrO4 and molecular weight 233.02 g/mol, is a CATO reference standard with documented purity and traceability.
The molecular framework of Methyl 3-bromo-2-oxo-2H-pyran-5-carboxylate (C7H5BrO4) is characterized by a carboxylic acid group, a hydroxyl group, an ether linkage, bromine substitution, an aromatic ring system. In reversed-phase chromatography, its retention is governed primarily by the polarity and ionization state of its functional groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. 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).
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), Methyl 3-bromo-2-oxo-2H-pyran-5-carboxylate 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 | C7H5BrO4 |
| Molecular Weight | 233.02 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-like odor) |
| Purity | 97%+ |
| Storage | Store in a cool place (≤25°C), 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; 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.) | 1969 |
| Halogen Content | Br-containing |
Related Methyl Standards
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Recommended Standards
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- 6-Bromo-2-methyl-4-nitropyridine-N-oxide, 97% (CAS 60323-99-1)
- Methyl 5-bromo-2-hydroxypyrimidine-4-carboxylate (CAS 71933-03-4)
- Benzyl 4-(benzylamino)piperidine-1-carboxylate hydrochloride (CAS 1203087-22-2)
- 7-Chloro-6-methoxy-2-methylbenzo[d]thiazole (CAS 2180719-30-4)
- 4-amino-4-methyl-cyclohexanone;hydrochloride (CAS 1262411-95-9)
- (S)-4-Chloro-2,3-dihydro-1H-inden-1-amine hydrochloride (CAS 2109874-07-7)
- (R)-1-(4-Chlorophenyl)-2,2,2-trifluoro-N-methylethan-1-amine (CAS 2381393-10-6)
- 2-(4-Aminobenzo[d]oxazol-2-yl)acetic acid (CAS 1555879-95-2)
- Ethyl 4-(1,3-diphenyl-1H-pyrazol-4-yl)-6-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidine-5-carboxylate (CAS 306281-18-5)
- 4-Amino-N-(2-pyridyl)benzamide (CAS 7467-42-7)
- 2-Chloro-3-(3,5-dimethyl-1H-pyrazol-1-yl)quinoxaline (CAS 245039-37-6)
- Semaglutide impurity 84 (CAS CATO-C4X-222684)
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