3-Ethynylthiophene-2-carboxylic acid CAS 1849196-26-4
| CAS No. | 1849196-26-4 |
| Molecular Formula | C7H4O2S |
| Molecular Weight | 152.17 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of 3-Ethynylthiophene-2-carboxylic acid is closely related to a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
3-Ethynylthiophene-2-carboxylic acid (CAS 1849196-26-4), molecular formula C7H4O2S and molecular weight 152.17 g/mol, is a CATO reference standard with documented purity and traceability.
3-Ethynylthiophene-2-carboxylic acid (C7H4O2S) contains a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system. 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).
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 | C7H4O2S |
| Molecular Weight | 152.17 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1995 |
| Sulfur Atoms | 1 |
Related Ethynylthiophene Standards
- 5-Ethynylthiophene-2-carboxylic acid (CAS 174672-58-3)
- 5-Ethynylthiophene-3-carboxylic acid (CAS 1849280-96-1)
- 4-Ethynylthiophene-2-carboxylic acid (CAS 1935990-01-4)
- Methyl 4-ethynylthiophene-2-carboxylate (CAS 1448423-03-7)
- Methyl 5-ethynylthiophene-2-carboxylate (CAS 177575-26-7)
- Methyl 3-ethynylthiophene-2-carboxylate (CAS 1800082-83-0)
- 3-Ethynylthiophene-2-carbaldehyde (CAS 221103-69-1)
- 4-Ethynylthiophene-2-carbaldehyde (CAS 913828-75-8)
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