1-(4-Fluoro-1H-pyrazol-1-yl)ethanone CAS 1936557-63-9
| CAS No. | 1936557-63-9 |
| Molecular Formula | C5H5FN2O |
| Molecular Weight | 128.10 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
1-(4-Fluoro-1H-pyrazol-1-yl)ethanone (CAS 1936557-63-9) is a high-purity analytical reference standard with the molecular formula C5H5FN2O and a molecular weight of 128.10 g/mol.
Owing to an amide group, a hydroxyl group, an ether linkage, fluorine substitution, 1-(4-Fluoro-1H-pyrazol-1-yl)ethanone is typically off-white to pale yellow liquid. Its solid-state physicochemical attributes — including a molecular weight of 128.10 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
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.
Physical & Chemical Properties
| Molecular Formula | C5H5FN2O |
| Molecular Weight | 128.10 g/mol |
| 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) | 4.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1996 |
| Halogen Content | F-containing |
| Nitrogen Atoms | 2 |
Related Fluoro Standards
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- 5-Fluoro-2-(hydroxymethyl)pyrimidine (CAS 1227574-72-2)
- 2-Fluoro-3-methoxypyrazine (CAS 1261489-99-9)
- 4-fluoro-5-methylfuran-2-carbaldehyde (CAS 1368383-51-0)
- 4-fluoro-5-methylfuran-3-carbaldehyde (CAS 1369383-36-7)
- 5-Fluoro-2-methylpyrimidin-4-ol (CAS 1480-91-7)
- 2-Fluoro-1-(1H-imidazol-1-yl)ethanone (CAS 161468-13-9)
- 3-Fluoro-1-methyl-1H-pyrazole-4-carbaldehyde (CAS 1934527-90-8)
Recommended Standards
- 6-Fluoro-2-methylpyridazin-3(2H)-one (CAS 1936313-15-3)
- (R)-3,3,3-Trifluoropropane-1,2-diamine (CAS 911630-84-7)
- 3-Fluoro-6-methoxypyridazine (CAS 1934842-49-5)
- 2-Amino-3-fluoropyridin-4(1H)-one (CAS 287916-12-5)
- 2,5-Dibromo-3,4-difluorothiophenol (CAS 1803836-19-2)
- Ald-C2-PEG4-azide (CAS 2030118-14-8)
- 2-Amino-2-(1,1-dioxidothietan-3-yl)acetic acid (CAS 1779360-08-5)
- 4-(5-Methyl-2-furyl)benzaldehyde (CAS 400748-10-9)
- (S)-tert-Butyl 1-(2-methoxybenzyl)pyrrolidin-3-ylcarbamate (CAS 1286209-04-8)
- 3-(2,4-Dichlorophenyl)isoxazol-5(4H)-one (CAS 352554-51-9)
- (R)-1-((4-amino-2-bromo-5-fluorophenyl)amino)-3-(benzyloxy)propan-2-ol 4-methylbenzenesulfonate (CAS 1294504-64-5)
- N-(2,4-Dichloro-5-methoxyphenyl)-3-(trifluoromethyl)benzamide (CAS 338961-09-4)
- N-Methylisoxazol-3-amine (CAS 55809-39-7)
- Semaglutide impurity 62 (CAS CATO-C4X-222662)
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