4-Methyl-1H-pyrazole-5-carboxylic acid CAS 1358752-83-6
| CAS No. | 1358752-83-6 |
| Molecular Formula | C5H6N2O2 |
| Molecular Weight | 126.11 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
4-Methyl-1H-pyrazole-5-carboxylic acid (CAS 1358752-83-6), molecular formula C5H6N2O2 and molecular weight 126.11 g/mol, is a CATO reference standard with documented purity and traceability.
Based on its molecular formula C5H6N2O2, 4-Methyl-1H-pyrazole-5-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 126.11 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).
As a certified reference material (CRM), 4-Methyl-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.
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.) | 1991 |
| Nitrogen Atoms | 2 |
Recommended Standards
- Furfuryl Formate (CAS 13493-97-5)
- (E)-5-Ethylideneimidazolidine-2,4-dione (CAS 137920-50-4)
- 5-Methoxypyrazin-2(1H)-one (CAS 134510-06-8)
- (Z)-5-Ethylideneimidazolidine-2,4-dione (CAS 137920-51-5)
- 5-(2-Hydroxybenzylidene)-2-thioxoimidazolidin-4-one (CAS 636-86-2)
- 5-methyl-1$l^{4},4-thiazepan-1-one hydrochloride (CAS 1795189-24-0)
- 6-Hydroxy-4-(4-hydroxy-3-methoxyphenyl)-7-methoxy-3a,4,9,9a-tetrahydronaphtho[2,3-c]furan-1(3H)-one (CAS 5474-93-1)
- 2-(6-Chloro-1H-indol-3-yl)acetonitrile (CAS 61220-58-4)
- 1-(4-(Hydroxymethyl)phenyl)cyclopropane-1-carbonitrile (CAS 1314648-27-5)
- 3-Amino-4-cyclopropylthiophene-2-carboxylic acid (CAS 1822680-39-6)
- 1,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8-heptadecafluoro-10-(prop-2-en-1-ylsulfanyl)decane 239463-91-3 Allyl 2-(perfluorooctyl)ethyl sulphide (CAS 239463-91-3)
- 2-(cyclopent-3-en-1-yl)acetaldehyde (CAS 14055-37-9)
- Baloxavir Impurity 106 (CAS CATO-C4X-2108106)
- Semaglutide impurity 255 (CAS CATO-C4X-2226255)
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