3-Bromo-1-methyl-1H-pyrazole-5-sulfonyl chloride CAS 1936381-19-9
| CAS No. | 1936381-19-9 |
| Molecular Formula | C4H4BrClN2O2S |
| Molecular Weight | 259.51 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of 3-Bromo-1-methyl-1H-pyrazole-5-sulfonyl chloride is closely related to an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, chlorine/bromine substitution in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
3-Bromo-1-methyl-1H-pyrazole-5-sulfonyl chloride (CAS 1936381-19-9), molecular formula C4H4BrClN2O2S and molecular weight 259.51 g/mol, is a CATO reference standard with documented purity and traceability.
The molecular framework of 3-Bromo-1-methyl-1H-pyrazole-5-sulfonyl chloride (C4H4BrClN2O2S) is characterized by an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, chlorine/bromine 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).
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.
CATO manufactures 3-Bromo-1-methyl-1H-pyrazole-5-sulfonyl chloride under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C4H4BrClN2O2S |
| Molecular Weight | 259.51 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.) | 1996 |
| Halogen Content | Cl/Br-containing |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 1 |
Related Bromo Standards
- 3-bromo-1-methyl-1H-pyrazole-4-sulfonyl chloride (CAS 1378866-77-3)
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- 5-bromo-1-methyl-1H-pyrazole-4-sulfonyl chloride (CAS 1781461-27-5)
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