5-(4-Ethoxyphenyl)-1H-pyrazol-3(2H)-one CAS 680615-79-6
| CAS No. | 680615-79-6 |
| Molecular Formula | C11H12N2O2 |
| Molecular Weight | 204.23 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.
5-(4-Ethoxyphenyl)-1H-pyrazol-3(2H)-one (CAS 680615-79-6), molecular formula C11H12N2O2 and molecular weight 204.23 g/mol, is a CATO reference standard with documented purity and traceability.
5-(4-Ethoxyphenyl)-1H-pyrazol-3(2H)-one (C11H12N2O2) contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage. It is notably hygroscopic, its high carbon-to-hydrogen ratio confers good lipid solubility, 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).
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 | C11H12N2O2 |
| Molecular Weight | 204.23 g/mol |
| Appearance | Off-white to pale 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) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1985 |
| Nitrogen Atoms | 2 |
Related Ethoxyphenyl Standards
- 3-(3-Ethoxyphenyl)isoxazol-5-amine (CAS 501902-17-6)
- 3-(4-Ethoxyphenyl)-1,2-oxazol-5-amine (CAS 54606-18-7)
- 3-(4-Ethoxyphenyl)-1H-pyrazol-5(4H)-one (CAS 496923-27-4)
- 5-(2-Ethoxyphenyl)-1H-1,2,4-triazol-3-amine (CAS 502685-95-2)
- 5-(4-Ethoxyphenyl)-1H-1,2,4-triazol-3-amine (CAS 502685-46-3)
- 5-(4-Ethoxyphenyl)isoxazol-3-amine (CAS 950236-38-1)
- Methyl 3-(4-ethoxyphenyl)propiolate (CAS 221148-26-1)
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Recommended Standards
- 5-(4-(Dimethylamino)phenyl)-1,3,4-oxadiazol-2-amine (CAS 59940-26-0)
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- 5-(2-Oxo-2-phenylethyl)pyrazolidin-3-one (CAS 62807-99-2)
- 5-(Dimethylamino)-2-methylisoindoline-1,3-dione (CAS 2307-01-9)
- 2-Bromo-5-(bromomethyl)furan (CAS 251649-67-9)
- 2,5-Difluoro-4-methylbenzoyl chloride (CAS 103877-56-1)
- Ethyl 2-(indolin-2-yl)acetate (CAS 64132-03-2)
- 4-Benzyl-2,2,6,6-Tetramethylmorpholine (CAS 58607-28-6)
- 7-(tert-Butyl) 2-ethyl 4-chloro-5,8-dihydro-1,7-naphthyridine-2,7(6H)-dicarboxylate (CAS 1884203-25-1)
- (2R,4R)-tert-Butyl 4-amino-2-(hydroxymethyl)pyrrolidine-1-carboxylate hydrochloride (CAS 1279038-50-4)
- Fulvestrant impurity 40 (CAS CATO-C4X-191740)
- 2-(1-(4-Bromophenyl)-3-phenyl-1H-pyrazol-4-yl)acetic acid (CAS 75821-70-4)
- Thiamine Impurity 18 HCl (CAS 70476-08-3)
- Influenza PR8 Hemagglutinin Peptide (110-119) (H-6312.0005) (CAS 132031-50-6)
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