5-(4-Bromo-phenyl)-isoxazole-3-carboxylic acid ethyl ester CAS 370855-64-4
| CAS No. | 370855-64-4 |
| Molecular Formula | C12H10BrNO3 |
| Molecular Weight | 296.12 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
5-(4-Bromo-phenyl)-isoxazole-3-carboxylic acid ethyl ester (CAS 370855-64-4), molecular formula C12H10BrNO3 and molecular weight 296.12 g/mol, is a CATO reference standard with documented purity and traceability.
Based on its molecular formula C12H10BrNO3, 5-(4-Bromo-phenyl)-isoxazole-3-carboxylic acid ethyl ester contains a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, bromine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 296.12 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).
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.
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 | C12H10BrNO3 |
| Molecular Weight | 296.12 g/mol |
| Appearance | Pale yellow to 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 chloroform, dichloromethane, ethyl acetate, 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) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2025 |
| Halogen Content | Br-containing |
| Nitrogen Atoms | 1 |
Related Bromo Standards
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- Ethyl 7-bromo-3,4-dihydro-4-oxoquinoline-3-carboxylate, 97% (CAS 1116339-64-0)
- Methyl 5-bromo-8-methyl-4-oxo-1,4-dihydroquinoline-2-carboxylate (CAS 1133116-21-8)
- 2-(6-Bromo-2-methyl-4-oxoquinolin-1(4H)-yl)acetic acid (CAS 1215543-11-5)
- Methyl 2-(6-bromo-4-oxoquinolin-1(4H)-yl)acetate (CAS 1219230-65-5)
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Recommended Standards
- 5-(3-Bromo-phenyl)-oxazole-4-carboxylic acid ethyl ester (CAS 885274-09-9)
- 5,7-Difluoro-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2,3-dihydro-1H-inden-1-ol (CAS 2201101-34-8)
- 4-Bromo-N-(6-methoxypyridin-3-yl)-1h-pyrrole-2-carboxamide (CAS 941055-08-9)
- 5-Amino-1-(4-bromobenzyl)-1H-1,2,3-triazole-4-carboxamide (CAS 886362-30-7)
- Iopydol (CAS 5579-92-0)
- Lithium4-vinylbenzenesulfonate (CAS 4551-88-6)
- Bis(trifluoro-2,4-pentanedionato)copper(II) (CAS 23677-93-2)
- Amino-PEG9-Boc (CAS 1818294-44-8)
- (3-Benzyloxy-1,1,2S-trimethyl-propoxy)-tert-butyl-dimethyl-silane (CAS 199191-11-2)
- 4-Fluoroisoquinolin-1-ol (CAS 1934536-53-4)
- 2-[(2r)-1-[(tert-butoxy)carbonyl]piperidin-2-yl]acetic acid (CAS 351410-32-7)
- 4-Fluoro-1-methyl-4-piperidinecarboxylic acid hydrochloride (CAS 1956309-76-4)
- 2-(4-Chloro-2-nitrophenoxy)ethan-1-amine (CAS 1183594-44-6)
- Semaglutide impurity 92 (CAS CATO-C4X-222692)
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