5-Butyl-4-fluoro-1H-pyrazol-3(2H)-one CAS 319459-73-9
| CAS No. | 319459-73-9 |
| Molecular Formula | C7H11FN2O |
| Molecular Weight | 158.17 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of 5-Butyl-4-fluoro-1H-pyrazol-3(2H)-one is closely related to an amide group, a hydroxyl group, an ether linkage, fluorine substitution in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
CATO supplies 5-Butyl-4-fluoro-1H-pyrazol-3(2H)-one (CAS 319459-73-9), a certified reference material (molecular formula C7H11FN2O, MW 158.17 g/mol) for analytical method development and quality control.
5-Butyl-4-fluoro-1H-pyrazol-3(2H)-one (C7H11FN2O) contains an amide group, a hydroxyl group, an ether linkage, fluorine substitution. Halogen substitution raises its density and boiling point; these physicochemical properties determine the optimal preparation and storage of its standard solutions. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
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 | C7H11FN2O |
| Molecular Weight | 158.17 g/mol |
| Appearance | White to pale yellow crystalline powder. (slight halide-like odor, faint amine-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, 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 |
| Degree of Unsaturation (DBE) | 3.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 2025 |
| Halogen Content | F-containing |
| Nitrogen Atoms | 2 |
Related Butyl Standards
- 2-fluoro-3-hydroxy-5,5-dimethylcyclohex-2-en-1-one (CAS 109801-21-0)
- 6-fluoro-1H,2H,3H-pyrrolo[2,3-b]pyridin-2-one (CAS 1190322-87-2)
- 6-fluoro-1H,2H,3H-pyrrolo[3,2-b]pyridin-2-one (CAS 136888-22-7)
- 8-Fluoro-1,4-dioxaspiro[4.5]dec-7-ene (CAS 142273-44-7)
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- 4-fluoro-1H,2H,3H-pyrrolo[2,3-b]pyridin-2-one (CAS 956460-93-8)
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Recommended Standards
- 5-(sec-Butyl)-4-fluoro-1H-pyrazol-3(2H)-one (CAS 319459-72-8)
- 5-Fluorobicyclo[3.1.1]Heptane-1-carboxylic acid (CAS 2231674-28-3)
- 4-Fluorobicyclo[4.1.0]Heptane-3-carboxylic acid (CAS 2167737-03-1)
- 6-fluoro-3H-isobenzofuran-1-one (CAS 23932-84-5)
- 4-(4-Methoxyphenyl)-5-(methylsulfonyl)-1,2,3-thiadiazole (CAS 1713655-98-1)
- Ethyl 4-(4-benzoylphenoxy)butanoate (CAS 1317831-16-5)
- (2R,4R)-1-(((9H-Fluoren-9-yl)methoxy)carbonyl)-4-methoxypyrrolidine-2-carboxylic acid (CAS 2137090-83-4)
- Tirzepatide Impurity 36 (CAS CATO-C4X-324036)
- 1-(2-Methoxyethyl)-2,3-dimethylpiperidin-4-one (CAS 845290-07-5)
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- 2-Chloro-6-(2-methoxyphenyl)nicotinic acid (CAS 462066-78-0)
- Z-Asp-OBzl (CAS 4779-31-1)
- Insulin Degludec Impurity 27 (CAS CATO-C4X-215727)
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