Ethyl 5-chlorobenzo[b]thiophene-2-carboxylate CAS 13771-67-0
| CAS No. | 13771-67-0 |
| Molecular Formula | C11H9ClO2S |
| Molecular Weight | 240.71 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
CATO supplies Ethyl 5-chlorobenzo[b]thiophene-2-carboxylate (CAS 13771-67-0), a certified reference material (molecular formula C11H9ClO2S, MW 240.71 g/mol) for analytical method development and quality control.
Structurally, Ethyl 5-chlorobenzo[b]thiophene-2-carboxylate (C11H9ClO2S) contains a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, chlorine substitution, an aromatic ring system. The molecule exhibits a degree of unsaturation (DBE) of 7.0, corresponding to approximately 7 ring(s) or double-bond equivalent(s). With a molecular weight of 240.71 g/mol, it falls into the medium-molecular-weight range. 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).
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 | C11H9ClO2S |
| Molecular Weight | 240.71 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| 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) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1960 |
| Halogen Content | Cl-containing |
| Sulfur Atoms | 1 |
Related Ethyl Standards
- Ethyl 6-Chlorobenzo[b]thiophene-2-carboxylate (CAS 105191-53-5)
- Ethyl 4-chlorobenzo[b]thiophene-2-carboxylate (CAS 1207537-67-4)
- 1-(4-Chlorobenzo[d]thiazol-2-yl)azetidin-3-ol (CAS 1421498-46-5)
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- Ethyl 7-chlorobenzo[b]thiophene-2-carboxylate (CAS 90407-15-1)
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- 4-(7-Chlorobenzo[d][1,3]dioxol-5-yl)oxazolidin-2-one (CAS 1484011-24-6)
- Ethyl 4-chlorobenzo[d]thiazole-2-carboxylate (CAS 1188144-96-8)
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