1-Ethyl-3-methyl-4-nitro-1H-pyrazole-5-carboxylic acid CAS 4490-75-9
| CAS No. | 4490-75-9 |
| Molecular Formula | C10H9NO2S |
| Molecular Weight | 207.25 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
As a certified reference material (CRM), 1-Ethyl-3-methyl-4-nitro-1H-pyrazole-5-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.
1-Ethyl-3-methyl-4-nitro-1H-pyrazole-5-carboxylic acid (CAS 4490-75-9), molecular formula C10H9NO2S and molecular weight 207.25 g/mol, is a CATO reference standard with documented purity and traceability.
The molecular framework of 1-Ethyl-3-methyl-4-nitro-1H-pyrazole-5-carboxylic acid (C10H9NO2S) is characterized by a nitrogen-containing heterocyclic scaffold, an amide group, a sulfone group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by its high hydrophobicity (logP), which provides a practical basis for HPLC-UV/DAD or LC-MS method development. 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 | C10H9NO2S |
| Molecular Weight | 207.25 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1958 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Recommended Standards
- 1,2-Benzisoxazole-3-carboxylicacidethylester (CAS 40991-36-4)
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