4-Ethynylthiophene-2-carboxylic acid CAS 1935990-01-4
| CAS No. | 1935990-01-4 |
| Molecular Formula | C7H4O2S |
| Molecular Weight | 152.17 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The molecular framework of 4-Ethynylthiophene-2-carboxylic acid (C7H4O2S) is characterized by a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system. In reversed-phase chromatography, its retention is governed primarily by the polarity and ionization state of its functional groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. 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).
CATO supplies 4-Ethynylthiophene-2-carboxylic acid (CAS 1935990-01-4), a certified reference material (molecular formula C7H4O2S, MW 152.17 g/mol) for analytical method development and quality control.
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.) | 1996 |
| Sulfur Atoms | 1 |
Related Ethynylthiophene Standards
- 5-Ethynylthiophene-2-carboxylic acid (CAS 174672-58-3)
- 3-Ethynylthiophene-2-carboxylic acid (CAS 1849196-26-4)
- 5-Ethynylthiophene-3-carboxylic acid (CAS 1849280-96-1)
- 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)
Recommended Standards
- 2-fluoroterephthalonitrile (CAS 1897-53-6)
- 5-Fluoroindolin-7-amine (CAS 194476-44-3)
- 3-Cyclopropyl-4-fluorophenol (CAS 1887175-94-1)
- (1R,2S)-2-(5-Fluoropyridin-3-yl)cyclopropan-1-amine (CAS 2227673-98-3)
- Oxazole, 2,2′-(1-methylethylidene)bis[4,5-dihydro-4-tricyclo[3.3.1.13,7]dec-1-yl-, (4R,4′R)- (CAS 497108-05-1)
- (S)-2-(Boc-amino)-4-(dimethylamino)-4-oxobutanoic Acid (CAS 70232-19-8)
- 3-phenyl-6H,7H-[1,2]oxazolo[4,5-d]pyrimidin-7-one (CAS 160687-68-3)
- 7-(2,3-Dihydroxypropyl)-7H-purine-2,6-diol (CAS 887833-16-1)
- 4-Iodo-1H-pyrrole-2-carbonitrile (CAS 87721-22-0)
- Hyoscyamine Impurity 14 (CAS CATO-C4X-343714)
- (2R,4S)-tert-Butyl 4-(aminomethyl)-2-methylpyrrolidine-1-carboxylate (CAS 1932373-68-6)
- H-D-Val-Leu-Arg-pNA (CAS 64816-14-4)
- 6-Ethyl-2-hydroxyquinoline-4-carboxylic acid (CAS 1247355-57-2)
- Des-Pro36-Tirzepatide (CAS CATO-CPTD788937)
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