3-Methylthiophene-2-sulfonic acid CAS 1159877-58-3
| CAS No. | 1159877-58-3 |
| Molecular Formula | C5H6O3S2 |
| Molecular Weight | 178.23 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
3-Methylthiophene-2-sulfonic acid (CAS 1159877-58-3), molecular formula C5H6O3S2 and molecular weight 178.23 g/mol, is a CATO reference standard with documented purity and traceability.
3-Methylthiophene-2-sulfonic acid (C5H6O3S2) contains a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage. It is notably hygroscopic, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. 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).
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 | C5H6O3S2 |
| Molecular Weight | 178.23 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO, water |
| Stability | May oxidize slowly on prolonged air exposure; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 3.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1989 |
| Sulfur Atoms | 2 |
Related Methylthiophene Standards
- 5-Methylthiophene-3-sulfonamide (CAS 1017264-52-6)
- 3-Methylthiophene-2-sulfonamide (CAS 81417-51-8)
- 5-Methylthiophene-2-sulfonamide (CAS 53595-69-0)
- N-methylthiophene-2-sulfonamide (CAS 53442-30-1)
- 4-ethyl-5-methylthiophene-3-carboxylic acid (CAS 884497-34-1)
- 5-ethyl-4-methylthiophene-2-carboxylic acid (CAS 40808-25-1)
- 4-Ethyl-5-methylthiophene-3-carbohydrazide (CAS 438225-41-3)
- 5-ethyl-4-methylthiophene-2-carbohydrazide (CAS 851169-15-8)
Recommended Standards
- 6-cyclohexylpyrimidin-4-ol (CAS 1159818-32-2)
- 2-aMino-N,N-diMethyl-2-phenylacetaMide (CAS 1161012-23-2)
- 4-(Tetrahydro-2H-pyran-4-yl)pyridin-2-amine (CAS 1159818-13-9)
- n-(4-Amino-2,6-dimethylphenyl)acetamide (CAS 116296-36-7)
- 4-Methyl-N-nitropyridin-2-amine (CAS 33245-30-6)
- 4,6-Dihydroxybenzofuran-3(2H)-one (CAS 3260-49-9)
- Methyl 3-amino-3-(2,3-difluorophenyl)propanoate (CAS 1339512-89-8)
- Fluorexon (CAS 1461-15-0)
- Sec-butyl (2R)-piperidine-2-carboxylate (CAS 1372901-82-0)
- 2-(Tert-butoxymethyl)morpholine (CAS 1342594-72-2)
- 2-(Difluoromethyl)-3-fluoro-4-hydroxypyridine-6-carbonyl chloride (CAS 1807137-05-8)
- 1-[4-(furan-2-yl)-6-(trifluoromethyl)pyrimidin-2-yl]piperidine-4-carboxylic acid (CAS 862712-45-6)
- 2-(3-Chloro-2-ethoxy-5-fluorophenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (CAS 2121511-33-7)
- Neuropeptide Y (2-36) (human, rat) trifluoroacetate salt (CAS 123139-39-9)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com