5-Methylthiophene-3-carboxylic Acid CAS 19156-50-4
| CAS No. | 19156-50-4 |
| Molecular Formula | C6H6O2S |
| Molecular Weight | 142.18 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 142.18 g/mol gives 5-Methylthiophene-3-carboxylic Acid distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
5-Methylthiophene-3-carboxylic Acid (CAS 19156-50-4), molecular formula C6H6O2S and molecular weight 142.18 g/mol, is a CATO reference standard with documented purity and traceability.
The molecular framework of 5-Methylthiophene-3-carboxylic Acid (C6H6O2S) 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).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
As a certified reference material (CRM), 5-Methylthiophene-3-carboxylic Acid meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
Physical & Chemical Properties
| Molecular Formula | C6H6O2S |
| Molecular Weight | 142.18 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1962 |
| Sulfur Atoms | 1 |
Related Methylthiophene Standards
- 4-Methylthiophene-2-carboxylic acid (CAS 14282-78-1)
- 2-Methylthiophene-3-carboxylic Acid (CAS 1918-78-1)
- 4-Methylthiophene-2-boronic Acid (CAS 162607-15-0)
- 5-Methylthiophene-2-boronic Acid (CAS 162607-20-7)
- 5-Methylthiophene-3-boronic acid (CAS 930303-82-5)
- 2-Methylthiophene-3-carboxamide (CAS 189329-96-2)
- 4-Methylthiophene-3-carboxamide (CAS 189330-32-3)
- (E)-5-methylthiophene-2-carbaldehyde oxime (CAS 42456-40-6)
Recommended Standards
- 1-methyl-1H-1,2,3-triazole-4-carbothioamide (CAS 1849225-56-4)
- 4-formylthiazole-2-carbonitrile (CAS 1824628-02-5)
- 6-methyl-2-sulfanylidene-1,2,3,4-tetrahydropyrimidin-4-one (CAS 1956-04-2)
- 4-Aminothiophene-3-carboxamide (CAS 1629395-92-1)
- 1-(2-(2-(Diisopropylamino)pyridin-3-yl)piperidin-1-yl)ethanone (CAS 1352527-14-0)
- Rel-((2S,4S)-4-fluoro-1-(thiophen-2-ylmethyl)pyrrolidin-2-yl)methanamine (CAS 1807941-84-9)
- Meptazinol (CAS 54340-58-8)
- (1R,2S,5R)-2-isopropyl-5-methylcyclohexyl acrylate (CAS 4835-96-5)
- Batatasin IV (CAS 60347-67-3)
- 1-(4-Aminoindolin-1-yl)ethanone (CAS 17274-64-5)
- N-Cyclohexyl-N-methylhydrazinecarbothioamide (CAS 122828-98-2)
- Salcaprozate Impurity 10 (CAS CATO-C4X-250710)
- 2-(2-Fluorophenoxy)propanehydrazide (CAS 727694-67-9)
- Eosinophilotactic Peptide (CAS 61756-28-3)
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