Ethyl 4-(4-fluorobenzoyl)isoxazole-3-carboxylate CAS 338420-60-3
| CAS No. | 338420-60-3 |
| Molecular Formula | C13H10FNO4 |
| Molecular Weight | 263.22 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.
Ethyl 4-(4-fluorobenzoyl)isoxazole-3-carboxylate (CAS 338420-60-3), molecular formula C13H10FNO4 and molecular weight 263.22 g/mol, is a CATO reference standard with documented purity and traceability.
Based on its molecular formula C13H10FNO4, Ethyl 4-(4-fluorobenzoyl)isoxazole-3-carboxylate contains a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, fluorine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 263.22 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).
As a certified reference material (CRM), Ethyl 4-(4-fluorobenzoyl)isoxazole-3-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 | C13H10FNO4 |
| Molecular Weight | 263.22 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 methanol, acetonitrile, DMSO, water (slightly soluble) |
| 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) | 9.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2025 |
| Halogen Content | F-containing |
| Nitrogen Atoms | 1 |
Related Ethyl Standards
- Ethyl 4-(2-fluorobenzoyl)isoxazole-3-carboxylate (CAS 338761-76-5)
- Methyl 5-[(4-fluorobenzoyl)amino]-2-furoate (CAS 477857-57-1)
- 2-(5-(4-Fluorobenzoyl)thiophen-2-yl)acetamide (CAS 339099-04-6)
- 2-[5-(2-Fluorobenzoyl)thiophen-2-yl]acetamide (CAS 339099-01-3)
- 2-(4-Fluorobenzoyl)benzoyl chloride (CAS 58677-60-4)
- 1-(4-Fluorobenzoyl)-4-(2-hydroxyethyl)-5-methyl-1,2-dihydro-3H-pyrazol-3-one (CAS 866018-39-5)
- 2-(5-(2-Fluorobenzoyl)thiophen-2-yl)acetic acid (CAS 339098-92-9)
- 2-[5-(4-Fluorobenzoyl)thiophen-2-yl]acetic acid (CAS 339098-81-6)
Recommended Standards
- 5-Methyl-7-(trifluoromethyl)-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrimidine-3-carbohydrazide (CAS 832741-04-5)
- N-(4-Fluorophenyl)-6-hydroxy-1-methyl-2-oxo-1,2-dihydropyrimidine-4-carboxamide (CAS 338774-85-9)
- 5-Methyl-7-(trifluoromethyl)-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrimidine-2-carbohydrazide (CAS 832739-21-6)
- N1-(2-nitro-4-(trifluoromethyl)phenyl)propane-1,3-diamine (CAS 381241-10-7)
- 2-([1,1'-Biphenyl]-4-yl)-3-(methylsulfonyl)-1H-pyrrole (CAS 1707379-25-6)
- But-2-en-1-yl (3-chloro-4-(difluoromethoxy)phenyl)carbamate (CAS 88714-94-7)
- Ethyl 6-bromo-2-chloronicotinate (CAS 1214335-22-4)
- 1-(3-(4-Methoxyphenyl)propyl)piperazine (CAS 59214-23-2)
- tert-Butyl (4-aminocyclohexyl)carbamate hydrochloride (CAS 1269484-61-8)
- 3-(3,4-Dimethoxybenzoyl)-4-hydroxyquinolin-2(1H)-one (CAS 90181-88-7)
- 2-(5-Methyl-3-(trifluoromethyl)-1H-pyrazol-1-yl)acetonitrile (CAS 1001500-48-6)
- (3AR,4S,6R,6aS)-6-(4-chloro-7H-pyrrolo[2,3-d]pyrimidin-7-yl)-2,2-dimethyltetrahydro-4H-cyclopenta[d][1,3]dioxol-4-ol (CAS 2086766-07-4)
- (E)-γ-[(4-Hydroxyphenyl)[4-(phenylmethoxy)phenyl]methylene]benzenepropanol (CAS 176671-76-4)
- Semaglutide Impurity 133 (CAS CATO-C4X-2226133)
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