2-Chlorothieno[3,2-b]thiophene CAS 39076-89-6
| CAS No. | 39076-89-6 |
| Molecular Formula | C6H3ClS2 |
| Molecular Weight | 174.67 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
CATO supplies 2-Chlorothieno[3,2-b]thiophene (CAS 39076-89-6), a certified reference material (molecular formula C6H3ClS2, MW 174.67 g/mol) for analytical method development and quality control.
Owing to sulfur-containing functionality, chlorine substitution, an aromatic ring system, 2-Chlorothieno[3,2-b]thiophene is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 174.67 g/mol — guide the selection of appropriate sample preparation and analytical techniques. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
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 | C6H3ClS2 |
| Molecular Weight | 174.67 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO |
| Stability | May oxidize slowly on prolonged air exposure |
| Degree of Unsaturation (DBE) | 5.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1968 |
| Halogen Content | Cl-containing |
| Sulfur Atoms | 2 |
Related Chlorothieno Standards
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- 4-Chlorothieno[2,3-b]pyridine (CAS 62226-17-9)
- 5-chlorothieno[3,2-b]pyridine (CAS 65977-55-1)
- 4-Chlorothieno[3,2-c]pyridine 27685-94-5 MFCD01861830 SY004073 (CAS 27685-94-5)
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Recommended Standards
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- 4-(4-Methoxy-2,5-dimethyl-phenyl)-4-oxo-butyric acid (CAS 4773-88-0)
- (1S,2S)-Ethyl 2-formylcyclopropanecarboxylate (CAS 109716-61-2)
- 4-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)-1-(1-(3-(trifluoro-methyl)phenyl)ethyl)-1H-pyrazole (CAS 1604036-71-6)
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