3-Oxo-2,3-dihydro-1H-pyrazole-4-carboxylic acid CAS 478968-51-3
| CAS No. | 478968-51-3 |
| Molecular Formula | C4H4N2O3 |
| Molecular Weight | 128.09 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 128.09 g/mol gives 3-Oxo-2,3-dihydro-1H-pyrazole-4-carboxylic acid distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
CATO supplies 3-Oxo-2,3-dihydro-1H-pyrazole-4-carboxylic acid (CAS 478968-51-3), a certified reference material (molecular formula C4H4N2O3, MW 128.09 g/mol) for analytical method development and quality control.
Based on its molecular formula C4H4N2O3, 3-Oxo-2,3-dihydro-1H-pyrazole-4-carboxylic acid contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 128.09 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
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 | C4H4N2O3 |
| Molecular Weight | 128.09 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO, water |
| 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 |
| CAS Registry Year (est.) | 2025 |
| Nitrogen Atoms | 2 |
Related Oxo Standards
- 4-Oxo-4,5-dihydro-1H-imidazole-2-carboxylic acid (CAS 861293-24-5)
- 5-Oxo-4,5-dihydro-1h-pyrazole-3-carboxylic acid (CAS 71173-77-8)
- 5,6-Dihydro-2H-pyran-3-carboxylic acid (CAS 100313-48-2)
- 3,6-dihydro-2H-pyran-2-carboxylic acid (CAS 116233-54-6)
- Methyl 4,5-dihydro-1H-pyrazole-5-carboxylate (CAS 164928-01-2)
- 1-Methyl-4,5-dihydro-1H-imidazole-4-carboxylic acid (CAS 17289-23-5)
- 1-(5,6-dihydro-1,4-dioxin-2-yl)ethan-1-one (CAS 59602-14-1)
- 2-Methyl-4,5-dihydro-1h-imidazole-4-carboxylic acid (CAS 902771-01-1)
Recommended Standards
- 3-Methyl-5-nitro-1H-1,2,4-triazole (CAS 24156-65-8)
- 4,4,4-Trifluoro-1-butanol (CAS 461-18-7)
- 3-Methyl-1,2,4-oxadiazole-5-carboxylic acid (CAS 944906-32-5)
- 3,3,3-Trifluoro-2-methylpropan-1-ol (CAS 431-23-2)
- 4-(1-Hydroxy-2-methylpropan-2-yl)benzonitrile (CAS 18755-57-2)
- 4-(4-Bromophenyl)-1,3-dihydro-2h-imidazol-2-one (CAS 6794-70-3)
- Zinc perchlorate hexahydrate (CAS 10025-64-6)
- NT1-014B (CAS 2739805-64-0)
- Butyl 2-pyridinecarboxylate (CAS 5340-88-5)
- (1S,3R,4R)-3-hydroxybicyclo[2.1.0]Pentane-1-carboxylic acid (CAS 2247104-02-3)
- 6-Oxo-1,6-dihydropyridazine-4-carboxamide (CAS 1935196-90-9)
- rac-(4R,5S)-4-amino-1-methyl-5-(pyridin-3-yl)pyrrolidin-2-one dihydrochloride (CAS 1909287-42-8)
- 5-Bromo-2-ethyl-4-methylthiazole (CAS 863190-90-3)
- Semaglutide impurity 29 (CAS 110990-08-4)
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