4-Hydroxythiophene-2-carbaldehyde CAS 293742-29-7
| CAS No. | 293742-29-7 |
| Molecular Formula | C5H4O2S |
| Molecular Weight | 128.15 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
4-Hydroxythiophene-2-carbaldehyde (C5H4O2S) contains a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage. 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).
4-Hydroxythiophene-2-carbaldehyde (CAS 293742-29-7), molecular formula C5H4O2S and molecular weight 128.15 g/mol, is a CATO reference standard with documented purity and traceability.
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 | C5H4O2S |
| Molecular Weight | 128.15 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 |
| CAS Registry Year (est.) | 2025 |
| Sulfur Atoms | 1 |
Related Hydroxythiophene Standards
- 5-Hydroxythiophene-2-carbaldehyde (CAS 144876-23-3)
- 3-Hydroxythiophene-2-carbaldehyde (CAS 5118-08-1)
- 3-Hydroxythiophene-2-carbonitrile (CAS 57059-19-5)
- 4-Hydroxythiophene-2-carbonitrile (CAS 256495-21-3)
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- 2-Acetyl-3-hydroxythiophene (CAS 5556-07-0)
- N-Hydroxythiophene-2-carboximidamide (CAS 53370-51-7)
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Recommended Standards
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