4-Pyrazolecarboxylic Acid CAS 37718-11-9
| CAS No. | 37718-11-9 |
| Molecular Formula | C4H4N2O2 |
| Molecular Weight | 112.09 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including 4-Pyrazolecarboxylic Acid.
4-Pyrazolecarboxylic Acid (CAS 37718-11-9), molecular formula C4H4N2O2 and molecular weight 112.09 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage, 4-Pyrazolecarboxylic Acid is typically off-white to pale yellow liquid. Its solid-state physicochemical attributes — including a molecular weight of 112.09 g/mol — guide the selection of appropriate sample preparation and analytical techniques. 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).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
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 | C4H4N2O2 |
| Molecular Weight | 112.09 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.) | 1967 |
| Nitrogen Atoms | 2 |
Related Pyrazolecarboxylic Standards
Recommended Standards
- 4-Oxazolecarboxamide (CAS 23012-15-9)
- 5-Amino-1,2,4-triazin-3(2H)-one (CAS 931-85-1)
- 4-Methyl-1,2,5-oxadiazole-3-carbaldehyde (CAS 90507-35-0)
- 5-Hydroxypyridazin-4(1H)-one (CAS 55271-47-1)
- 2-{[(4-chlorophenyl)methyl]sulfanyl}acetic acid (CAS 90649-82-4)
- 2-((1H-1,2,4-Triazol-3-yl)amino)quinazolin-4(1H)-one (CAS 61741-45-5)
- 4-(trifluoromethyl)pyridine-3-carbaldehyde (CAS 1083197-78-7)
- 4-Bromo-3-methyl-N-propylbenzenesulfonamide (CAS 794570-18-6)
- 1-Benzyl-5-iodo-4-(4-methoxyphenyl)-1H-1,2,3-triazole (CAS 1516891-28-3)
- Cefminox Impurity 8 (CAS CATO-C4X-19268)
- Methyl 5-amino-3-bromo-2-fluorobenzoate (CAS 1803581-88-5)
- (2R,3S,5S)-2-(6-amino-9H-purin-9-yl)-5-(iodomethyl)tetrahydrofuran-3,4-diol (CAS 4099-81-4)
- 4-(2,4-Dimethyl-1H-imidazol-5-yl)pyridine (CAS 701298-24-0)
- D-Ile12-Tirzepatide (CAS CATO-CPTD788921)
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