3-Chlorothieno[2,3-b]thiophene-2-carboxylic acid CAS 39244-08-1
| CAS No. | 39244-08-1 |
| Molecular Formula | C7H3ClO2S2 |
| Molecular Weight | 218.68 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
As a certified reference material (CRM), 3-Chlorothieno[2,3-b]thiophene-2-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.
3-Chlorothieno[2,3-b]thiophene-2-carboxylic acid (CAS 39244-08-1) is a high-purity analytical reference standard with the molecular formula C7H3ClO2S2 and a molecular weight of 218.68 g/mol.
3-Chlorothieno[2,3-b]thiophene-2-carboxylic acid (C7H3ClO2S2) contains a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, chlorine substitution, an aromatic ring system. Halogen substitution raises its density and boiling point, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.
Physical & Chemical Properties
| Molecular Formula | C7H3ClO2S2 |
| Molecular Weight | 218.68 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1968 |
| Halogen Content | Cl-containing |
| Sulfur Atoms | 2 |
Related Chlorothieno Standards
- 5-Chlorothieno[3,2-b]thiophene-2-carboxylic acid (CAS 70060-15-0)
- 5-Chlorothieno[2,3-d][1,2,3]thiadiazole-6-carboxylic acid (CAS 192878-32-3)
- 4-chlorothieno[3,2-c]pyridine-7-carboxamide (CAS 55040-49-8)
- 4-chlorothieno[3,2-c]pyridine-2-carboxylic acid (CAS 1360891-68-4)
- 7-chlorothieno[2,3-c]pyridine-4-carboxylic acid (CAS 1360959-24-5)
- 6-chlorothieno[2,3-b]pyridine-2-carboxylic acid (CAS 1536794-94-1)
- 4-chlorothieno[3,2-c]pyridine-7-carboxylic acid (CAS 55040-48-7)
- 7-chlorothieno[3,2-b]pyridine-2-carboxylic acid (CAS 596793-57-6)
Recommended Standards
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- 4-(4-Chlorobenzyl)phenol (CAS 52890-73-0)
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- 2,6-Diacetylisonicotinonitrile (CAS 132855-00-6)
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- Bendamustine Impurity 27 (CAS 1366085-72-4)
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