(1-(4-Chlorophenyl)-3-(3-oxo-3,4-dihydroquinoxalin-2-yl)-1H-pyrazol-5-yl)methyl acetate CAS 66940-28-1
| CAS No. | 66940-28-1 |
| Molecular Formula | C20H15ClN4O3 |
| Molecular Weight | 394.81 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of (1-(4-Chlorophenyl)-3-(3-oxo-3,4-dihydroquinoxalin-2-yl)-1H-pyrazol-5-yl)methyl acetate is closely related to a steroid core, an amide group, a hydroxyl group, an ether linkage, chlorine substitution in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
(1-(4-Chlorophenyl)-3-(3-oxo-3,4-dihydroquinoxalin-2-yl)-1H-pyrazol-5-yl)methyl acetate (CAS 66940-28-1) is a high-purity analytical reference standard with the molecular formula C20H15ClN4O3 and a molecular weight of 394.81 g/mol.
Structurally, (1-(4-Chlorophenyl)-3-(3-oxo-3,4-dihydroquinoxalin-2-yl)-1H-pyrazol-5-yl)methyl acetate (C20H15ClN4O3) contains a steroid core, an amide group, a hydroxyl group, an ether linkage, chlorine substitution. The molecule exhibits a degree of unsaturation (DBE) of 15.0, corresponding to approximately 15 ring(s) or double-bond equivalent(s). With a molecular weight of 394.81 g/mol, it falls into the moderately-high-molecular-weight range. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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), (1-(4-Chlorophenyl)-3-(3-oxo-3,4-dihydroquinoxalin-2-yl)-1H-pyrazol-5-yl)methyl acetate 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 | C20H15ClN4O3 |
| Molecular Weight | 394.81 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) | 15.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1976 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 4 |
Related Chlorophenyl Standards
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- 6-S-(4-Chlorophenyl)-6-thio-inosine (CAS 132089-81-7)
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Recommended Standards
- Dapagliflozin Impurity 172 (CAS CATO-C4X-1138172)
- 1,4-Diamino-6-chloro-2-(3-methoxyphenoxy)anthracene-9,10-dione (CAS 88605-23-6)
- Empagliflozin impurity 258 (CAS CATO-C4X-1065258)
- 1,4-Diamino-7-chloro-2-(4-methoxyphenoxy)anthracene-9,10-dione (CAS 88605-34-9)
- (2E)-2-(1-Phenylethylidene)hydrazinecarbothioamide (CAS 132121-93-8)
- 1-(6-Ethoxypyrimidin-4-yl)piperidine-3-carboxylic acid (CAS 1353984-32-3)
- n-(Piperidin-4-yl)-4-(trifluoromethyl)pyrimidin-2-amine (CAS 874647-06-0)
- 1,3-Phenylenediethanol (CAS 46133-05-5)
- (3-Methyl-5-(4-methyl-1H-imidazol-1-yl)phenyl)boronic acid (CAS 2225169-69-5)
- 3,3'-(9H,9'H-[3,4'-Bicarbazole]-9,9'-diyl)dibenzonitrile (CAS 1622297-83-9)
- Methyl 4-isopropoxybenzofuran-6-carboxylate (CAS 1291488-37-3)
- 1-(Trimethylsilyl)-4-n-propylbenzene (CAS 81631-65-4)
- Tert-butyl 4-(cyclohexanecarboxamido)piperidine-1-carboxylate (CAS 1233955-27-5)
- Semaglutide impurity 259 (CAS CATO-C4X-2226259)
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