1,3-Dimethyl-1h-pyrazole-5-sulfonyl chloride CAS 1245820-90-9
| CAS No. | 1245820-90-9 |
| Molecular Formula | C5H7ClN2O2S |
| Molecular Weight | 194.64 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 194.64 g/mol gives 1,3-Dimethyl-1h-pyrazole-5-sulfonyl chloride distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
1,3-Dimethyl-1h-pyrazole-5-sulfonyl chloride (CAS 1245820-90-9) is a high-purity analytical reference standard with the molecular formula C5H7ClN2O2S and a molecular weight of 194.64 g/mol.
The molecular framework of 1,3-Dimethyl-1h-pyrazole-5-sulfonyl chloride (C5H7ClN2O2S) 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. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
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 | C5H7ClN2O2S |
| Molecular Weight | 194.64 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 DMSO, DMF, methanol |
| 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) | 3.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1990 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 1 |
Related Dimethyl Standards
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Recommended Standards
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- 2-(1H-Pyrazol-1-yl)ethanesulfonyl chloride (CAS 1196146-43-6)
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