4-(3,5-Di-tert-butyl-4-oxocyclohexa-2,5-dien-1-ylidene)-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one CAS 153787-33-8
| CAS No. | 153787-33-8 |
| Molecular Formula | C24H28N2O2 |
| Molecular Weight | 376.49 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including 4-(3,5-Di-tert-butyl-4-oxocyclohexa-2,5-dien-1-ylidene)-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one.
CATO supplies 4-(3,5-Di-tert-butyl-4-oxocyclohexa-2,5-dien-1-ylidene)-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one (CAS 153787-33-8), a certified reference material (molecular formula C24H28N2O2, MW 376.49 g/mol) for analytical method development and quality control.
Owing to a steroid core, an amide group, a hydroxyl group, an ether linkage, 4-(3,5-Di-tert-butyl-4-oxocyclohexa-2,5-dien-1-ylidene)-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 376.49 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.
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 | C24H28N2O2 |
| Molecular Weight | 376.49 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) | 12.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2000 |
| Nitrogen Atoms | 2 |
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