4-Acetyl-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one CAS 4173-74-4
| CAS No. | 4173-74-4 |
| Molecular Formula | C12H12N2O2 |
| Molecular Weight | 216.24 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of 4-Acetyl-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one is closely related to an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
4-Acetyl-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one (CAS 4173-74-4) is a high-purity analytical reference standard with the molecular formula C12H12N2O2 and a molecular weight of 216.24 g/mol.
Owing to an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage, 4-Acetyl-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 216.24 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).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
As a certified reference material (CRM), 4-Acetyl-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one 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 | C12H12N2O2 |
| Molecular Weight | 216.24 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| 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 |
| Degree of Unsaturation (DBE) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1958 |
| Nitrogen Atoms | 2 |
Recommended Standards
- 4,8-Dimethyl-5,7-dihydropyrrolo[2,3-f]indole-2,6(1H,3H)-dione (CAS 397283-37-3)
- 4-Amino-2-methyl-5-phenyl-1H-pyrrole-3-carboxylic acid (CAS 62237-44-9)
- 4,5-Dimethoxy-2-phenylpyrimidine (CAS 477857-51-5)
- 4-Amino-N-(2-furylmethyl)benzamide (CAS 680185-86-8)
- 749920-54-5 2-Chloro-6-fluoroquinoline-3-carboxaldehyde MFCD06337019 (CAS 749920-54-5)
- (3-Fluoro-4-morpholinophenyl)methanamine (CAS 870843-45-1)
- 3-Chloro-4-methylquinolin-2(1H)-one (CAS 502142-56-5)
- 3-pyridylÂmethyl-triphenyl phosphonium chloride hydrochloride (CAS 34377-83-8)
- 2-(4-METHOXYPHENYL)PIPERIDINE HCL (CAS 859297-83-9)
- Azelaic acid (CAS 123-99-9)
- 3-(tert-Butyl)pyridin-2-ol (CAS 1822705-32-7)
- 2-Bromo-2-methyl-N-(3-(trifluoromethyl)phenyl)propanamide (CAS 1970-58-7)
- 2-chloro-5-(chloromethyl)pyrazine (CAS 105985-21-5)
- D-[His]1-Semaglutide X TFA salt (CAS CATO-CPTD788634)
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