4-Formyl-1-methyl-1H-pyrazole-5-sulfonyl chloride CAS 2138573-84-7
| CAS No. | 2138573-84-7 |
| Molecular Formula | C5H5ClN2O3S |
| Molecular Weight | 208.62 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
4-Formyl-1-methyl-1H-pyrazole-5-sulfonyl chloride (CAS 2138573-84-7), molecular formula C5H5ClN2O3S and molecular weight 208.62 g/mol, is a CATO reference standard with documented purity and traceability.
The molecular framework of 4-Formyl-1-methyl-1H-pyrazole-5-sulfonyl chloride (C5H5ClN2O3S) is characterized by an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, chlorine substitution. 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. 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 | C5H5ClN2O3S |
| Molecular Weight | 208.62 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO, water |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1997 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 1 |
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- N-(4,5-Dihydrothiazol-2-yl)-1-(4-fluorobenzyl)-3-((4-fluorobenzyl)oxy)-1H-pyrazole-4-carboxamide (CAS 1014068-32-6)
- Dihydroformononetin (CAS 4626-22-6)
- 6-Chloro-2-iodo-9-methyl-9H-purine (CAS 247193-36-8)
- 2,4,5-Trimethyl-N-(1h-pyrazol-4-yl)furan-3-carboxamide (CAS 1154945-91-1)
- 6-Iodoimidazo[1,2-a]pyridine-2-carbohydrazide (CAS 860784-46-9)
- chondroitin sulfate impurity C (CAS CATO-C4X-32813)
- 1-Methyl-N-(4-(3-methyl-1,2,4-oxadiazol-5-yl)phenyl)-1H-1,2,3-triazole-4-carboxamide (CAS 1226444-59-2)
- Semaglutide impurity 202 (CAS CATO-C4X-2226202)
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