1-Ethyl-1h-pyrazole-5-sulfonamide CAS 1339319-92-4
| CAS No. | 1339319-92-4 |
| Molecular Formula | C5H9N3O2S |
| Molecular Weight | 175.21 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of 1-Ethyl-1h-pyrazole-5-sulfonamide is closely related to an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
1-Ethyl-1h-pyrazole-5-sulfonamide (CAS 1339319-92-4), molecular formula C5H9N3O2S and molecular weight 175.21 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, 1-Ethyl-1h-pyrazole-5-sulfonamide is typically white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 175.21 g/mol — guide the selection of appropriate sample preparation and analytical techniques. 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 | C5H9N3O2S |
| Molecular Weight | 175.21 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| 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 |
| Degree of Unsaturation (DBE) | 3.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1991 |
| Nitrogen Atoms | 3 |
| Sulfur Atoms | 1 |
Recommended Standards
- N,N-Dimethyl-1H-pyrazole-1-sulfonamide (CAS 133228-21-4)
- 4-Ethyl-3-(methylsulfonyl)-4H-1,2,4-triazole (CAS 1363210-23-4)
- 5-Thiocyanato-1H-benzo[d]imidazole (CAS 132474-64-7)
- 5-Amino-2-(2-methoxyethyl)-1,2,4-thiadiazol-3(2H)-one (CAS 1365942-69-3)
- (6-Bromo-5-(difluoromethyl)pyridin-3-yl)methanol (CAS 1805202-08-7)
- 6-Bromo-3-(bromomethyl)benzofuran (CAS 1133005-32-9)
- 2,6-Difluoro-3-[(4-methylpiperidin-1-yl)sulfonyl]benzoic acid (CAS 656816-21-6)
- 5-Cyano-3,4-dihydroxy-thiophene-2-carboxylic acid ethyl ester (CAS 79763-59-0)
- N-(3-Chloro-4-hydroxyphenyl)methanesulfonamide (CAS 321962-11-2)
- 2-(3,3-Dimethylbutyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (CAS 167692-94-6)
- 2-Amino-8-hydroxy-1,2,3,4-tetrahydro-naphthalene-2-carboxylic acid (CAS 168628-97-5)
- Ramelteon Impurity 35 (CAS CATO-C4X-262235)
- Danshenol B (CAS 189308-09-6)
- Copper Peptide ·2 acetate salt (CAS 130120-57-9)
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