Ethyl3-bromo-6,6-difluoro-5,7-dihydropyrazolo[5,1-b][1,3]oxazine-2-carboxylate CAS 2128657-45-2
| CAS No. | 2128657-45-2 |
| Molecular Formula | C9H9BrF2N2O3 |
| Molecular Weight | 311.08 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
Ethyl3-bromo-6,6-difluoro-5,7-dihydropyrazolo[5,1-b][1,3]oxazine-2-carboxylate (CAS 2128657-45-2), molecular formula C9H9BrF2N2O3 and molecular weight 311.08 g/mol, is a CATO reference standard with documented purity and traceability.
The molecular framework of Ethyl3-bromo-6,6-difluoro-5,7-dihydropyrazolo[5,1-b][1,3]oxazine-2-carboxylate (C9H9BrF2N2O3) is characterized by a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, fluorine/bromine substitution. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
As a certified reference material (CRM), Ethyl3-bromo-6,6-difluoro-5,7-dihydropyrazolo[5,1-b][1,3]oxazine-2-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 | C9H9BrF2N2O3 |
| Molecular Weight | 311.08 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-like odor, faint amine-like odor, low volatility) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| 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.) | 1997 |
| Halogen Content | F/Br-containing |
| Nitrogen Atoms | 2 |
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Recommended Standards
- {5-[2,6-Dichloro-4-(trifluoromethyl)phenyl]-2-furyl}methanol (CAS 259243-86-2)
- 5,8-Difluoro-3-oxo-3,4-dihydro-2H-benzo[b][1,4]oxazine-6-boronic Acid Pinacol Ester (CAS 1221502-87-9)
- Cyclopropyl(2,6-difluoro-4-iodopyridin-3-yl)methanol (CAS 2863532-85-6)
- 4-Fluoro-3-nitro-5-(tetramethyl-1,3,2-dioxaborolan-2-yl)benzoic acid (CAS 2377609-20-4)
- 3-Methylisothiazole-4-carbohydrazide (CAS 89179-69-1)
- 2,4-Dimethoxy-N-phenylaniline (CAS 90043-09-7)
- 2,3,5,6-Tetramethyl-1,4-dioxane-2,5-diol (CAS 23147-57-1)
- L-Lactide (CAS 4511-42-6)
- (3-Bromo-5,6,7,8-tetrahydroquinolin-8-yl)methanamine (CAS 2387601-86-5)
- APN-C3-PEG4-alkyne (CAS 2183440-36-8)
- 1-(2,4-Dihydroxy-6-methoxy-3,5-dimethylphenyl)-2-methylpropan-1-one (CAS 97761-90-5)
- Ursodeoxycholic Acid EP Impurity G (CAS 10538-55-3)
- 3,4,5-Trimethyl-1H-pyrazole-1-carbonyl chloride (CAS 67514-64-1)
- Semaglutide impurity 244(Fmoc-His(Fmoc)-Aib-OH) (CAS CATO-C4X-2226244)
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