5-Methyl-2-(4-nitrophenyl)-2,4-dihydro-3H-pyrazol-3-one CAS 6402-09-1
| CAS No. | 6402-09-1 |
| Molecular Formula | C10H9N3O3 |
| Molecular Weight | 219.20 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
As a certified reference material (CRM), 5-Methyl-2-(4-nitrophenyl)-2,4-dihydro-3H-pyrazol-3-one 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.
5-Methyl-2-(4-nitrophenyl)-2,4-dihydro-3H-pyrazol-3-one (CAS 6402-09-1), molecular formula C10H9N3O3 and molecular weight 219.20 g/mol, is a CATO reference standard with documented purity and traceability.
5-Methyl-2-(4-nitrophenyl)-2,4-dihydro-3H-pyrazol-3-one (C10H9N3O3) contains an amino-acid-derived structure, 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. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
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.
Physical & Chemical Properties
| Molecular Formula | C10H9N3O3 |
| Molecular Weight | 219.20 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (faint amine-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1958 |
| Nitrogen Atoms | 3 |
Related Methyl Standards
- 5-Ethyl-3-(4-nitrophenyl)-1,2,4-oxadiazole (CAS 10185-65-6)
- 5-Ethyl-3-(3-nitrophenyl)-1,2,4-oxadiazole (CAS 10364-69-9)
- 3-(2-Methyl-6-nitrophenyl)isoxazol-5-amine (CAS 1152517-46-8)
- 5-Methyl-2-(3-nitrophenyl)-2,4-dihydro-3H-pyrazol-3-one (CAS 119-16-4)
- 5-Methyl-1-(2-nitrophenyl)-2,3-dihydro-1h-imidazol-2-one (CAS 1197478-23-1)
- 1-(2-nitrophenyl)-3-prop-2-yn-1-ylurea (CAS 1197861-80-5)
- [4-(4-nitrophenyl)-1h-imidazol-2-yl]methanol (CAS 1340189-83-4)
- 5-methyl-1-(3-nitrophenyl)-2,3-dihydro-1H-imidazol-2-one (CAS 13870-56-9)
Recommended Standards
- 5-Methyl-2-(4-nitrophenyl)-1,2-dihydro-3H-pyrazol-3-one (CAS 35496-23-2)
- 5-Methyl-N-(2-oxo-1,2-dihydropyridin-3-yl)isoxazole-3-carboxamide (CAS 343566-51-8)
- 5-Methyl-2-(2-nitrophenyl)-1H-pyrazol-3(2H)-one (CAS 40339-61-5)
- 6,7-Dihydroxyisoquinoline-3-carbohydrazide (CAS 740772-05-8)
- 7-Methoxy-4,4-dimethyl-1,2,3,4-tetrahydroquinoline (CAS 1783463-30-8)
- 3,5-Difluoro-4-((1R,3R)-2-(2-fluoro-2-methylpropyl)-3-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-1-yl)phenol (CAS 2173404-70-9)
- (2-Chloro-4-(diisopropylcarbamoyl)phenyl)boronic acid (CAS 2096331-79-0)
- N-(1-Hydroxy-2-methylpropan-2-yl)-6,7-dihydro-5H-pyrazolo[5,1-b][1,3]oxazine-2-carboxamide (CAS 1428352-44-6)
- N-(4-Isopropylphenyl)-5-methoxy-1-methyl-4-oxo-1,4-dihydropyridine-2-carboxamide (CAS 1040659-33-3)
- (-)-Diacetyl-D-tartaric anhydride (CAS 70728-23-3)
- 6-Methyl-3-nitro-2-oxo-1,2-dihydropyridin-4-yl 2-bromobenzoate (CAS 868679-76-9)
- 2-({[(1-{bicyclo[2.2.1]heptan-2-yl}ethyl)carbamoyl]methyl}sulfanyl)benzoic acid (CAS 1005106-53-5)
- 3-Fluoro-3-(3-methoxyphenyl)propiophenone (CAS 898774-72-6)
- Semaglutide impurity 206 (CAS CATO-C4X-2226206)
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