4-Isoxazolecarboxylic acid, 3-(5-fluoro-2-pyridinyl)-5-methyl-, ethyl ester CAS 1159252-10-4
| CAS No. | 1159252-10-4 |
| Molecular Formula | C12H11FN2O3 |
| Molecular Weight | 250.23 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 250.23 g/mol gives 4-Isoxazolecarboxylic acid, 3-(5-fluoro-2-pyridinyl)-5-methyl-, ethyl ester distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
CATO supplies 4-Isoxazolecarboxylic acid, 3-(5-fluoro-2-pyridinyl)-5-methyl-, ethyl ester (CAS 1159252-10-4), a certified reference material (molecular formula C12H11FN2O3, MW 250.23 g/mol) for analytical method development and quality control.
Based on its molecular formula C12H11FN2O3, 4-Isoxazolecarboxylic acid, 3-(5-fluoro-2-pyridinyl)-5-methyl-, ethyl ester 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 250.23 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
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 | C12H11FN2O3 |
| Molecular Weight | 250.23 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 DMSO, DMF, methanol |
| 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.) | 1989 |
| Halogen Content | F-containing |
| Nitrogen Atoms | 2 |
Related Isoxazolecarboxylic Standards
- 3-Isoxazolecarboxylic acid, 4-phenyl-, ethyl ester (CAS 96129-46-3)
- 5-phenyl-3-isoxazolecarboxylic acid (CAS 14441-90-8)
- 133674-35-8 5-Isoxazolecarboxylic acid, 3-(1-methylethyl)-, methyl ester (9CI) (CAS 133674-35-8)
- 5-acetyl-3-Isoxazolecarboxylic acid (CAS 145441-17-4)
- 5-Isoxazolecarboxylic Acid Methyl Ester (CAS 15055-81-9)
- 3-Isoxazolecarboxylic acid, methyl ester (CAS 25742-68-1)
- 5-Isoxazolecarboxylic acid hydrazide (CAS 855746-95-1)
- 5-Isoxazolecarboxylic Acid (CAS 21169-71-1)
Recommended Standards
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