1-Methylpyrazole-3-sulfonyl Chloride CAS 89501-90-6
| CAS No. | 89501-90-6 |
| Molecular Formula | C4H5ClN2O2S |
| Molecular Weight | 180.61 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Based on its molecular formula C4H5ClN2O2S, 1-Methylpyrazole-3-sulfonyl Chloride contains an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, chlorine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 180.61 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
1-Methylpyrazole-3-sulfonyl Chloride (CAS 89501-90-6), molecular formula C4H5ClN2O2S and molecular weight 180.61 g/mol, is a CATO reference standard with documented purity and traceability.
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
As a certified reference material (CRM), 1-Methylpyrazole-3-sulfonyl Chloride meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
Physical & Chemical Properties
| Molecular Formula | C4H5ClN2O2S |
| Molecular Weight | 180.61 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.) | 1982 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 1 |
Related Methylpyrazole Standards
- 5-Methylpyrazole-4-sulfonyl Chloride (CAS 1179918-36-5)
- 1-methylpyrazole-4-sulfonyl chloride 288148-34-5 4-(Chlorosulphonyl)-1-methyl-1H-pyrazole (CAS 288148-34-5)
- 1-Methylpyrazole-5-sulfonamide (CAS 918335-69-0)
- 5-Ethyl-1-methylpyrazole-4-carboxylic Acid (CAS 1007541-96-9)
- 1-Ethyl-3-methylpyrazole-4-carboxylic acid (CAS 113131-46-7)
- 1-Ethyl-3-methylpyrazole-5-carboxylic Acid (CAS 50920-65-5)
- 1-Ethyl-5-methylpyrazole-3-carboxylic Acid (CAS 50920-46-2)
- Ethyl 3-Methylpyrazole-4-carboxylate (CAS 85290-78-4)
Recommended Standards
- 1-Methyl-1H-imidazole-5-sulfonyl chloride (CAS 479552-18-6)
- 2-Chloro-6-fluoronaphthalene (CAS 59079-71-9)
- 1-CHloro-4-fluoronaphthalene (CAS 315-51-5)
- 2-Methyl-1H-imidazole-4-sulphonyl chloride (CAS 205311-54-2)
- [(4-Fluoropiperidin-4-yl)methyl][(5-methylpyridin-2-yl)methyl]amine trihydrochloride (CAS 1149761-70-5)
- (1R,2R)-1,2-bis(3,5-dimethylphenyl)ethane-1,2-diamine phosphate (CAS 1391500-72-3)
- (R)-1-(tert-butoxycarbonyl)-4,4-difluoropyrrolidine-3-carboxylic acid (CAS 2381910-72-9)
- 6-Methoxy-2-(tributylstannyl)nicotinaldehyde (CAS 2265921-90-0)
- (S)-3-(4-Acetylphenyl)-4-isopropyloxazolidin-2-one (CAS 572923-19-4)
- L-Serine(benzylether)ethylester.HCl (CAS 58178-57-7)
- 4-Iodo-N-methylbenzene-1-sulfonamide (CAS 134283-64-0)
- tert-Butyl (4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)thiophen-2-yl)carbamate (CAS 943323-78-2)
- 2-(Chloromethyl)benzothiazole (CAS 37859-43-1)
- Semaglutide impurity 229 (CAS CATO-C4X-2226229)
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