5-Methyl-1H-pyrazole-3-carboxylic acid CAS 402-61-9
| CAS No. | 402-61-9 |
| Molecular Formula | C5H6N2O2 |
| Molecular Weight | 126.11 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
CATO manufactures 5-Methyl-1H-pyrazole-3-carboxylic acid under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
CATO supplies 5-Methyl-1H-pyrazole-3-carboxylic acid (CAS 402-61-9), a certified reference material (molecular formula C5H6N2O2, MW 126.11 g/mol) for analytical method development and quality control.
5-Methyl-1H-pyrazole-3-carboxylic acid (C5H6N2O2) 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).
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 | C5H6N2O2 |
| Molecular Weight | 126.11 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| 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.) | 1957 |
| Nitrogen Atoms | 2 |
Recommended Standards
- 5-Methoxy-pyrimidin-4-ol (CAS 71133-25-0)
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- 5-Methylisoxazole-3-carboxamide (CAS 3445-52-1)
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Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com