1-Ethyl-5-methyl-4-nitro-1H-pyrazole-3-carboxylic acid CAS 50920-47-3
| CAS No. | 50920-47-3 |
| Molecular Formula | C7H9N3O4 |
| Molecular Weight | 199.16 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
1-Ethyl-5-methyl-4-nitro-1H-pyrazole-3-carboxylic acid (C7H9N3O4) 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. 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).
1-Ethyl-5-methyl-4-nitro-1H-pyrazole-3-carboxylic acid (CAS 50920-47-3), molecular formula C7H9N3O4 and molecular weight 199.16 g/mol, is a CATO reference standard with documented purity and traceability.
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.
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 | C7H9N3O4 |
| Molecular Weight | 199.16 g/mol |
| Appearance | Off-white to pale 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, water |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 5.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1971 |
| Nitrogen Atoms | 3 |
Recommended Standards
- 1-Ethyl-3-methyl-4-nitro-1h-pyrazole-5-carboxylic acid (CAS 26308-39-4)
- 2-(2-Imino-4,6-dioxotetrahydropyrimidin-1(2H)-yl)propanoic acid (CAS 874495-37-1)
- 1-Ethyl-2-methyl-4-nitro-1H-imidazole-5-carboxylic acid (CAS 54828-46-5)
- 2-(3,5-Dimethyl-4-nitro-1H-pyrazol-1-yl)acetic acid (CAS 345637-69-6)
- 3-amino-1-methylcyclobutan-1-ol (CAS 1502504-47-3)
- 2-(6-(Tert-butyl)naphthalen-2-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (CAS 1620789-31-2)
- 1-(4-(2-Chloroethyl)piperazin-1-yl)ethan-1-one hydrochloride (CAS 92928-18-2)
- tert-Butyl (R)-7-oxooctahydro-2H-pyrazino[1,2-a]pyrazine-2-carboxylate (CAS 2924021-47-4)
- Ethyl 3-Amino-3-(N-Boc-3-pyrrolidyl)propanoate (CAS 887986-07-4)
- Etofenamate Impurity 12 (CAS CATO-C4X-260312)
- 3-(2,5-Dioxo-2,5-dihydro-1h-pyrrol-1-yl)benzene-1-sulfonamide (CAS 1020993-03-6)
- 2-(5-Ethylbenzofuran-3-yl)acetic acid (CAS 882248-24-0)
- 2-(Difluoromethyl)-3-fluoro-4-methoxypyridine-6-acetonitrile (CAS 1805048-96-7)
- endo-Arg30-Semaglutide (CAS CATO-C4X-2226281)
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