4-(2-Mercaptoethyl)-3-methyl-1H-pyrazol-5(4H)-one CAS 7767-86-4
| CAS No. | 7767-86-4 |
| Molecular Formula | C15H26N2O3 |
| Molecular Weight | 282.38 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.
4-(2-Mercaptoethyl)-3-methyl-1H-pyrazol-5(4H)-one (CAS 7767-86-4), molecular formula C15H26N2O3 and molecular weight 282.38 g/mol, is a CATO reference standard with documented purity and traceability.
4-(2-Mercaptoethyl)-3-methyl-1H-pyrazol-5(4H)-one (C15H26N2O3) contains a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage. It is notably hygroscopic, 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 | C15H26N2O3 |
| Molecular Weight | 282.38 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) | 4.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1959 |
| Nitrogen Atoms | 2 |
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- 339019-71-5 5-(2-chlorophenyl)-3-{[(2,5-dichlorophenyl)sulfanyl]methyl}isoxazole KS-00003DDO (CAS 339019-71-5)
- Methyl 2-methyl-2-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)propanoate (CAS 890839-10-8)
- 1-(Difluoromethyl)-3-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (CAS 2675491-23-1)
- 6-FLUORO-3-IODO-1H-INDOLE (CAS 741265-04-3)
- (1-(3-Fluorophenyl)-1H-1,2,3-triazol-4-yl)methanol (CAS 1096130-65-2)
- Semaglutide impurity 198 (CAS CATO-C4X-2226198)
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