3-Hydroxybenzo[b]thiophene-2-carboxylic acid CAS 191031-07-9
| CAS No. | 191031-07-9 |
| Molecular Formula | C9H6O3S |
| Molecular Weight | 194.21 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
3-Hydroxybenzo[b]thiophene-2-carboxylic acid (CAS 191031-07-9), molecular formula C9H6O3S and molecular weight 194.21 g/mol, is a CATO reference standard with documented purity and traceability.
Based on its molecular formula C9H6O3S, 3-Hydroxybenzo[b]thiophene-2-carboxylic acid contains a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 194.21 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. 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 | C9H6O3S |
| Molecular Weight | 194.21 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2011 |
| Sulfur Atoms | 1 |
Related Hydroxybenzo Standards
- 7-Hydroxybenzo[b]thiophene-6-carboxylic acid (CAS 1000774-33-3)
- 1-(5-Hydroxybenzo[c][1,2,5]thiadiazol-4-yl)ethanone (CAS 120893-39-2)
- 7-Hydroxybenzo[b]thiophene-5-carboxylic acid (CAS 1221448-81-2)
- 6-HYDROXYBENZO[B]THIOPHENE-2-CARBOXYLIC ACID (CAS 1432040-88-4)
- 5-Hydroxybenzo[b]thiophene-3-carboxylic acid (CAS 16304-39-5)
- 4-Hydroxybenzo[b]thiophene-5-carboxylic acid (CAS 197014-73-6)
- 5-Hydroxybenzo[b]thiophene-2-carboxylic acid (CAS 95094-87-4)
- 7-Hydroxybenzo[b]thiophene-2-carboxylic acid (CAS 88791-09-7)
Recommended Standards
- 4,4-dioxo-1,4-oxathiepane-6-carboxylic acid (CAS 1895436-08-4)
- (1-ethyl-7-fluoro-1H-1,3-benzodiazol-4-yl)methanol (CAS 1934685-81-0)
- 2-(Azetidine-1-carbonyl)-4-fluoroaniline (CAS 1856947-31-3)
- (7-fluoro-1,2-dimethyl-1H-1,3-benzodiazol-4-yl)methanol (CAS 1935275-40-3)
- 2-Chloro-N-ethyl-N-(4-methylbenzyl)acetamide (CAS 63142-88-1)
- 1-[(3,5-Difluorophenyl)methyl]piperazine (CAS 868054-29-9)
- 2,2,2-Trifluoro-1-(3-(hexylthio)phenyl)ethan-1-one (CAS 1443354-16-2)
- 2-(4-Benzylpiperazin-1-yl)isonicotinonitrile (CAS 1016862-98-8)
- (2R)-2-methyl-5-oxopyrrolidine-2-carboxylic acid (CAS 1629052-62-5)
- 3-Acetamidoacrylic acid (CAS 6627-63-0)
- Ethyl 5-methyl-2-(pyrimidin-2-yl)-2H-1,2,3-triazole-4-carboxylate (CAS 1431729-04-2)
- Pipermethystine (CAS 71627-22-0)
- 2-Chloro-5-(2,6-dichlorophenyl)pyrimidine (CAS 1361727-82-3)
- Semaglutide Impurity 190 (CAS CATO-C4X-2226190)
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