1-Methyl-4-(1,2-oxazol-5-yl)-1h-pyrazole-3-carboxylic acid CAS 956985-41-4
| CAS No. | 956985-41-4 |
| Molecular Formula | C8H7N3O3 |
| Molecular Weight | 193.16 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The molecular framework of 1-Methyl-4-(1,2-oxazol-5-yl)-1h-pyrazole-3-carboxylic acid (C8H7N3O3) is characterized by an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, 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.
1-Methyl-4-(1,2-oxazol-5-yl)-1h-pyrazole-3-carboxylic acid (CAS 956985-41-4), molecular formula C8H7N3O3 and molecular weight 193.16 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.
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 | C8H7N3O3 |
| Molecular Weight | 193.16 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 |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1987 |
| Nitrogen Atoms | 3 |
Related Methyl Standards
- 1-Methyl-3-(1,3-oxazol-2-yl)-1H-pyrazole-5-carboxylic acid (CAS 2091447-00-4)
- 1-Methyl-4-(1,2-oxazol-5-yl)-1h-pyrazole-5-carboxylic acid (CAS 925200-28-8)
- 1-(Oxazol-5-yl)bicyclo[2.1.1]Hexane-5-carboxylic acid (CAS 2174001-35-3)
- 2-(Oxazol-2-yl)pyrimidine-5-carboxylic acid (CAS 1447606-41-8)
- 2-(Oxazol-5-yl)pyrimidine-5-carboxylic acid (CAS 1447606-56-5)
- 1-(Oxazol-2-yl)-2-propylpentan-1-one (CAS 898759-38-1)
- 1-(Oxazol-2-yl)octan-1-one (CAS 898758-36-6)
- 3-Ethyl-1-(oxazol-2-yl)hexan-1-one (CAS 898759-35-8)
Recommended Standards
- 1-Methyl-3-(5-nitrofuran-2-yl)-1H-pyrazole (CAS 61621-23-6)
- 1-Methyl-4-nitro-1,2-dihydro-3H-indazol-3-one (CAS 878156-08-2)
- 1-Methoxy-6-nitro-1H-benzo[d]imidazole (CAS 24246-33-1)
- 1-Methyl-4-oxo-4,7-dihydro-1H-pyrazolo[3,4-b]pyridine-5-carboxylic acid (CAS 54738-83-9)
- N-(4-Acetamidophenyl)-1-[3-(trifluoromethyl)benzenesulfonyl]pyrrolidine-2-carboxamide (CAS 317822-02-9)
- (1S,5R)-7-(Trifluoromethyl)-2,3,4,5-tetrahydro-1H-1,5-methanobenzo[d]azepine (CAS 357425-68-4)
- 1-Isopropyl-1H-indol-4-amine (CAS 1173986-92-9)
- 3'-Nitro-[1,1'-biphenyl]-4-sulfonyl chloride (CAS 101366-50-1)
- 2-Fluoro-6-methylbenzene-1-sulfonyl chloride (CAS 1092350-02-1)
- 4-[3,4-Dihydro-1(2H)-quinolinyl]aniline (CAS 861038-20-2)
- trans-3-(aminomethyl)-1-methyl-cyclobutanol (CAS 1438241-21-4)
- rel-tert-Butyl (3R,5R)-3-amino-5-fluoropiperidine-1-carboxylate (CAS 1638772-27-6)
- 3-(4-Fluorophenyl)-1-(4-(methylthio)phenyl)propan-1-one (CAS 898768-11-1)
- Semaglutide impurity 78 (CAS CATO-C4X-222678)
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