(1-ETHYL-5-HYDROXY-1H-PYRAZOL-4-YL)-(3-METHANESULFONYL-2,5-DIMETHYL-4-OXAZOL-2-YL-PHENYL)-METHANONE CAS 1231603-95-4
| CAS No. | 1231603-95-4 |
| Molecular Formula | C18H19N3O5S |
| Molecular Weight | 389.43 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.
(1-ETHYL-5-HYDROXY-1H-PYRAZOL-4-YL)-(3-METHANESULFONYL-2,5-DIMETHYL-4-OXAZOL-2-YL-PHENYL)-METHANONE (CAS 1231603-95-4), molecular formula C18H19N3O5S and molecular weight 389.43 g/mol, is a CATO reference standard with documented purity and traceability.
The molecular framework of (1-ETHYL-5-HYDROXY-1H-PYRAZOL-4-YL)-(3-METHANESULFONYL-2,5-DIMETHYL-4-OXAZOL-2-YL-PHENYL)-METHANONE (C18H19N3O5S) is characterized by a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
As a certified reference material (CRM), (1-ETHYL-5-HYDROXY-1H-PYRAZOL-4-YL)-(3-METHANESULFONYL-2,5-DIMETHYL-4-OXAZOL-2-YL-PHENYL)-METHANONE 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 | C18H19N3O5S |
| Molecular Weight | 389.43 g/mol |
| 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) | 11.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1990 |
| Nitrogen Atoms | 3 |
| Sulfur Atoms | 1 |
Related ETHYL Standards
- (1-Ethyl-5-hydroxy-1H-pyrazol-4-yl)-(4-methanesulfonyl-2,5-dimethyl-3-oxazol-2-yl-phenyl)-methanone (CAS 1231565-55-1)
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Recommended Standards
- (3-Ethanesulfonyl-2,5-dimethyl-4-oxazol-2-yl-phenyl)-(5-hydroxy-1-methyl-1H-pyrazol-4-yl)-methanone (CAS 1231571-03-1)
- Ondansetron Impurity 13 (CAS 126671-73-6)
- 4-(3,5-Dimethyl-1H-pyrazole-1-carbonyl)-N-(4-methoxyphenyl)-3-methyl-1H-pyrazole-5-sulfonamide (CAS 1298033-83-6)
- (4-ETHANESULFONYL-2,5-DIMETHYL-3-OXAZOL-2-YL-PHENYL)-(5-HYDROXY-1-METHYL-1H-PYRAZOL-4-YL)-METHANONE (CAS 1231550-52-9)
- 4-(Perfluoropropyl)thiazol-2-amine (CAS 850747-87-4)
- 3-(Chloromethyl)-2-methylfuran (CAS 14497-33-7)
- 4,7-Bis(5-bromo-4-(2-ethylhexyl)thiophen-2-yl)-5,6-difluorobenzo[c][1,2,5]thiadiazole (CAS 1293389-32-8)
- 6-Bromo-2-cyclopropyl-5-methylbenzo[d]oxazole (CAS 1267224-21-4)
- Aprepitant Impurity 59 (CAS 1341734-61-9)
- 4-(chloromethyl)-3-methyl-1H-pyrrolo[2,3-b]pyridine (CAS 1638767-19-7)
- Diethyl (3-chloro-2-oxopropyl)phosphonate (CAS 67257-29-8)
- tert-Butyl (3-bromo-6,7-dihydro-5H-pyrazolo[5,1-b][1,3]oxazin-6-yl)carbamate (CAS 2238820-25-0)
- 3-Methoxyphenyl 6-bromo-2-oxo-2H-chromene-3-carboxylate (CAS 324066-42-4)
- Galanin-Like Peptide (rat) trifluoroacetate salt (CAS 245114-97-0)
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