4-(4-Chlorophenyl)-2-(3-methyl-5-oxo-1-phenyl-4,5-dihydro-1H-pyrazol-4-yl)-4-oxobutanoic acid CAS 138560-56-2
| CAS No. | 138560-56-2 |
| Molecular Formula | C20H17ClN2O4 |
| Molecular Weight | 384.81 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 384.81 g/mol gives 4-(4-Chlorophenyl)-2-(3-methyl-5-oxo-1-phenyl-4,5-dihydro-1H-pyrazol-4-yl)-4-oxobutanoic acid distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
4-(4-Chlorophenyl)-2-(3-methyl-5-oxo-1-phenyl-4,5-dihydro-1H-pyrazol-4-yl)-4-oxobutanoic acid (CAS 138560-56-2), molecular formula C20H17ClN2O4 and molecular weight 384.81 g/mol, is a CATO reference standard with documented purity and traceability.
4-(4-Chlorophenyl)-2-(3-methyl-5-oxo-1-phenyl-4,5-dihydro-1H-pyrazol-4-yl)-4-oxobutanoic acid (C20H17ClN2O4) contains a flavonoid core, an amide group, a hydroxyl group, an ether linkage, chlorine substitution. It is notably hygroscopic, halogen substitution raises its density and boiling point, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. 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), 4-(4-Chlorophenyl)-2-(3-methyl-5-oxo-1-phenyl-4,5-dihydro-1H-pyrazol-4-yl)-4-oxobutanoic 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 | C20H17ClN2O4 |
| Molecular Weight | 384.81 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) | 13.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1996 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
Related Chlorophenyl Standards
- 1-(3-(3-(3-Chlorophenyl)-1,2,4-oxadiazol-5-yl)pyridin-2-yl)piperidine-4-carboxylic acid (CAS 1260934-87-9)
- 1-(4-Chlorophenyl)-2-(4-(3-(trifluoromethyl)phenyl)piperazin-1-yl)ethan-1-ol (CAS 400075-68-5)
- (E)-1-[2-(4-Chlorophenyl)-4-methyl-1,3-thiazol-5-yl]-3-(2-nitrophenyl)-2-propen-1-one (CAS 1211932-77-2)
- 3-((4-(2-Chlorophenyl)piperazin-1-yl)sulfonyl)-1H-pyrazole-4-carbohydrazide (CAS 1370592-49-6)
- 2-((2-(2-(3-Chlorophenyl)thiazol-4-yl)ethyl)amino)-5-nitrobenzonitrile (CAS 861207-14-9)
- 4-((4-Chlorophenyl)thio)-3-nitro-N-phenylbenzamide (CAS 303988-25-2)
- 2-(2-Chlorophenyl)-1-{4-[6-(trifluoromethyl)pyrimidin-4-yl]piperazin-1-yl}ethan-1-one (CAS 1775313-01-3)
- 1-[(4-Chlorophenyl)methyl]-3-(pyrrolidine-1-carbonyl)-6-(trifluoromethyl)-1,2-dihydropyridin-2-one (CAS 551921-72-3)
Recommended Standards
- N-(1-Aza-2-(1,3-dioxoindan-2-yl)prop-1-enyl)-2-(4-chloro-2-methylphenoxy)ethanamide (CAS 1024693-06-8)
- 4-((5-Chloro-6-oxo-1-(p-tolyl)-1,6-dihydropyridazin-4-yl)oxy)-3-ethoxybenzaldehyde (CAS 881580-97-8)
- dimethyl 2-[(2-chloro-1,3-thiazol-5-yl)methyl]-2-(2-nitrophenyl)malonate (CAS 860786-11-4)
- 5-({4-[(3-Chlorobenzyl)oxy]phenyl}methylene)-1,3-dimethyl-2,4,6(1H,3H,5H)-pyrimidinetrione (CAS 477862-22-9)
- 3-(Pyrrolidin-1-yl)-6-(4-((2-(trifluoromethyl)phenyl)sulfonyl)piperazin-1-yl)pyridazine (CAS 1226440-85-2)
- Ethyl 2,2-difluoro-2-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)acetate (CAS 1683545-35-8)
- Tetrachloromethane (CAS 56-23-5)
- 727379-97-7 13C-Lactate (1-13C)Lactate (CAS 727379-97-7)
- Ethyl thieno[2,3-b]pyridine-5-carboxylate (CAS 99429-77-3)
- 2-Amino-2-(3-chloro-4,5-dihydroisoxazol-5-yl)acetic acid (CAS 52583-41-2)
- 7-Fluoro-1,2,3,4-tetrahydronaphthalen-2-amine hydrochloride (CAS 1884425-10-8)
- 2,3-Bis(3-fluorophenyl)pyridine (CAS 1214340-37-0)
- 7-HC-γ-linolenate (CAS 161180-12-7)
- Semaglutide impurity 83 (CAS CATO-C4X-222683)
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