1-Methyl-3-nitro-1H-pyrazole-4-carboxylic acid CAS 39205-68-0
| CAS No. | 39205-68-0 |
| Molecular Formula | C5H5N3O4 |
| Molecular Weight | 171.11 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
1-Methyl-3-nitro-1H-pyrazole-4-carboxylic acid (C5H5N3O4) contains a carbohydrate-derived structure, an amide group. 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-Methyl-3-nitro-1H-pyrazole-4-carboxylic acid (CAS 39205-68-0), molecular formula C5H5N3O4 and molecular weight 171.11 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.
As a certified reference material (CRM), 1-Methyl-3-nitro-1H-pyrazole-4-carboxylic acid 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.
Physical & Chemical Properties
| Molecular Formula | C5H5N3O4 |
| Molecular Weight | 171.11 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 |
| CAS Registry Year (est.) | 1968 |
| Nitrogen Atoms | 3 |
Related Methyl Standards
- 1-Methyl-4-nitro-1H-imidazole-2-carboxylic acid (CAS 109012-24-0)
- 2-Methyl-5-nitro-1H-imidazole-4-carboxylic acid (CAS 116273-51-9)
- 1-Methyl-5-nitro-1h-pyrazole-3-carboxylic acid (CAS 1171709-53-7)
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- 1-Methyl-3-nitro-1h-pyrazole-5-carboxylic acid (CAS 177409-39-1)
- Methyl 3-nitro-1H-pyrazole-4-carboxylate (CAS 1798715-16-8)
Recommended Standards
- 1-Methyl-2-nitro-1H-Imidazole-5-carboxylic acid (CAS 50700-55-5)
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- 1-Methyl-4-nitro-1H-pyrazole-3-carboxylic Acid (CAS 4598-86-1)
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