4-((4-Chlorophenyl)(hydroxy)methylene)-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one CAS 146271-26-3
| CAS No. | 146271-26-3 |
| Molecular Formula | C17H13ClN2O2 |
| Molecular Weight | 312.75 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.
4-((4-Chlorophenyl)(hydroxy)methylene)-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one (CAS 146271-26-3), molecular formula C17H13ClN2O2 and molecular weight 312.75 g/mol, is a CATO reference standard with documented purity and traceability.
Based on its molecular formula C17H13ClN2O2, 4-((4-Chlorophenyl)(hydroxy)methylene)-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one contains a steroid core, an amide group, a hydroxyl group, an ether linkage, chlorine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 312.75 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
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 | C17H13ClN2O2 |
| Molecular Weight | 312.75 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 |
| 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) | 12.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1998 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
Related Chlorophenyl Standards
- N-(2-Chlorophenyl)-5-methyl-1-phenyl-1H-1,2,4-triazole-3-carboxamide (CAS 1000572-01-9)
- 1-Benzyl-5-(4-chlorophenyl)-1H-pyrazole-3-carboxylic Acid (CAS 1020236-01-4)
- 1365963-83-2 N-(4-Chlorophenyl)-2-[4-(2-hydroxyethyl)-3-oxomorpholin-2-yl]acetamide MFCD22056571 (CAS 1365963-83-2)
- 5-(4-Chlorophenyl)-1-(4-methylphenyl)-1H-pyrazole-3-carboxylic acid (CAS 158941-09-4)
- Ethyl 2-(4-chlorophenyl)quinazoline-4-carboxylate (CAS 1956383-25-7)
- (E)-4-(((3-Chlorophenyl)amino)methylene)-2-(p-tolyl)oxazol-5(4H)-one (CAS 380645-27-2)
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Recommended Standards
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- 4-Chloro-6-methoxy-7-(2-(2-methoxyethoxy)ethoxy)cinnoline (CAS 197359-53-8)
- n1,n1-Dimethyl-n2-(prop-2-yn-1-yl)ethane-1,2-diamine (CAS 1020972-51-3)
- 5-(chloromethyl)-2-methyl-thiazole (CAS 63140-11-4)
- Ethyl 2-(propylamino)acetate (CAS 40693-96-7)
- 6-Chloro-2-(2,5-dimethylphenyl)quinoline-4-carbonyl chloride (CAS 1160263-15-9)
- 1-Ethyl-8-methoxy-4-oxo-1,4-dihydroquinoline-3-carboxylic acid (CAS 32932-14-2)
- N'-acetyl-3-bromobenzohydrazide (CAS 173406-71-8)
- 3-(5-Bromofuran-2-yl)-1,4-dimethyl-1h-pyrazol-5-amine (CAS 1152663-17-6)
- DiiSopropyl (5-fluoro-2-hydroxyphenyl)phosphonate (CAS 1592980-01-2)
- 4-(1,4-diazepan-1-yl)-3,5-difluorobenzoic acid hydrochloride (CAS 1797549-43-9)
- Peptide WE-14 (CAS 115136-18-0)
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