Ethyl thieno[2,3-b]thiophene-2-carboxylate CAS 335030-45-0
| CAS No. | 335030-45-0 |
| Molecular Formula | C9H8O2S2 |
| Molecular Weight | 212.29 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.
Ethyl thieno[2,3-b]thiophene-2-carboxylate (CAS 335030-45-0), molecular formula C9H8O2S2 and molecular weight 212.29 g/mol, is a CATO reference standard with documented purity and traceability.
Structurally, Ethyl thieno[2,3-b]thiophene-2-carboxylate (C9H8O2S2) contains a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system. The molecule exhibits a degree of unsaturation (DBE) of 6.0, corresponding to approximately 6 ring(s) or double-bond equivalent(s). With a molecular weight of 212.29 g/mol, it falls into the medium-molecular-weight range. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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 | C9H8O2S2 |
| Molecular Weight | 212.29 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2025 |
| Sulfur Atoms | 2 |
Related Ethyl Standards
- Ethyl thieno[3,2-b]thiophene-2-carboxylate (CAS 201004-08-2)
- Ethyl thieno[3,2-d]isothiazole-5-carboxylate (CAS 74598-11-1)
- Thieno[2,3-c]pyridine-2-sulfonamide (CAS 115063-53-1)
- thieno[3,2-b]pyridine-6-sulfonamide (CAS 1803589-89-0)
- ethyl thieno[2,3-b]pyridine-2-carboxylate (CAS 59944-78-4)
- ethyl thieno[2,3-c]pyridine-2-carboxylate (CAS 478148-99-1)
- ethyl thieno[3,2-b]pyridine-6-carboxylate (CAS 83179-08-2)
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Recommended Standards
- Ethyl 7-cyclopropyl-7-oxoheptanoate (CAS 898776-33-5)
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- exo-2-Amino-7-Boc-azabicyclo[2.2.1]heptane (CAS 500556-93-4)
- Ethyl 5-cyclopentyl-5-oxovalerate (CAS 24071-97-4)
- 4-Amino-3-methoxyquinolin-2-ol (CAS 668469-57-6)
- Methyl 4-chloro-1-cyclopentyl-1H-pyrazole-3-carboxylate (CAS 1856075-83-6)
- Benzyl (R)-2-methyl-5-oxopiperidine-1-carboxylate (CAS 1616434-59-3)
- 1-(2-(1H-Pyrazol-1-yl)phenyl)ethan-1-amine (CAS 936940-55-5)
- 2-Chloro-3-(trifluoromethyl)benzonitrile (CAS 62584-32-1)
- 2-Amino-7-((2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-4-oxo-4,7-dihydro-1H-pyrrolo[2,3-d]pyrimidine-5-carboxylic acid (CAS 81645-08-1)
- Dibenzo[a,h]phenazine-1,8-diol (CAS 26846-41-3)
- Methyl 5-(hydroxymethyl)-2-methylfuran-3-carboxylate (CAS 15341-69-2)
- 4,4,4-trifluoro-2-methylbutane-1-sulfonyl chloride (CAS 1784373-64-3)
- Peptide Impurity 04 (CAS 2913424-91-4)
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