1-(2-Fluorophenyl)-3-methoxy-1H-pyrazole-5-carboxylic acid CAS 1781899-13-5
| CAS No. | 1781899-13-5 |
| Molecular Formula | C11H9FN2O3 |
| Molecular Weight | 236.20 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
1-(2-Fluorophenyl)-3-methoxy-1H-pyrazole-5-carboxylic acid (CAS 1781899-13-5), molecular formula C11H9FN2O3 and molecular weight 236.20 g/mol, is a CATO reference standard with documented purity and traceability.
Based on its molecular formula C11H9FN2O3, 1-(2-Fluorophenyl)-3-methoxy-1H-pyrazole-5-carboxylic acid 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 236.20 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.
As a certified reference material (CRM), 1-(2-Fluorophenyl)-3-methoxy-1H-pyrazole-5-carboxylic acid 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 | C11H9FN2O3 |
| Molecular Weight | 236.20 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, 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) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1994 |
| Halogen Content | F-containing |
| Nitrogen Atoms | 2 |
Related Fluorophenyl Standards
- Methyl 1-(4-fluorophenyl)-5-hydroxy-1H-pyrazole-3-carboxylate (CAS 1007073-76-8)
- Ethyl 3-(2-fluorophenyl)-1,2,4-oxadiazole-5-carboxylate (CAS 1018125-37-5)
- 3-(5-(4-Fluorophenyl)-1,3,4-oxadiazol-2-yl)propanoic acid (CAS 1082828-46-3)
- 1-(4-Fluorophenyl)-4-methoxy-1h-pyrazole-3-carboxylic acid (CAS 1169973-47-0)
- 1-(2-Fluorophenyl)-5-methoxy-1H-pyrazole-3-carboxylic acid (CAS 1239726-11-4)
- Ethyl 3-(3-fluorophenyl)-1,2,4-oxadiazole-5-carboxylate (CAS 1239736-58-3)
- 1-(3-Fluorophenyl)-6-oxo-1,4,5,6-tetrahydropyridazine-3-carboxylic acid (CAS 1273860-31-3)
- Ethyl 5-(3-fluorophenyl)-1,2,4-oxadiazole-3-carboxylate (CAS 1274477-51-8)
Recommended Standards
- 1-(4-Fluorophenyl)-3-methoxy-1H-pyrazole-5-carboxylic acid (CAS 1781775-18-5)
- methyl 2-fluoro-4-(5-methyl-1H-1,2,3,4-tetrazol-1-yl)benzoate (CAS 1864015-28-0)
- Ethyl 3-(4-fluorophenyl)-1,2,4-oxadiazole-5-carboxylate (CAS 163719-81-1)
- Ethyl 7-fluoro-2-oxo-2H-chromene-3-carboxylate (CAS 1883574-88-6)
- 2-(3-Methyl-4-oxo-3,4-dihydrophthalazin-1-yl)propanoic acid (CAS 298682-21-0)
- 5-(2-(4-Chloro-3,5-dimethyl-1h-pyrazol-1-yl)ethyl)-2h-tetrazole (CAS 1005566-25-5)
- (S)-Benzyl 2-((ethylamino)methyl)pyrrolidine-1-carboxylate (CAS 1354017-34-7)
- Lithium trihydroxy(5-(trifluoromethyl)pyridin-2-yl)borate (CAS 1393822-86-0)
- Fulvestrant Impurity 47 (CAS 96044-45-0)
- 2-[(methoxycarbonyl)amino]-4-methylpentanoic acid (CAS 117919-56-9)
- 2-((5h-[1,2,4]triazino[5,6-b]indol-3-yl)thio)-N-([1,1'-biphenyl]-2-yl)acetamide (CAS 332384-83-5)
- Ethyl (2-((5-((1-methyl-1H-pyrrol-2-yl)methyl)-4-phenethyl-4H-1,2,4-triazol-3-yl)thio)acetyl)glycinate (CAS 847390-82-3)
- 6-Bromo-3-fluoro-1H-pyrrolo[3,2-b]pyridine (CAS 1352397-61-5)
- Autoinducing Peptide I trifluoroacetate salt (CAS 200010-29-3)
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