5-Methylthieno[3,2-b]thiophene-2-carboxylic acid CAS 70060-21-8
| CAS No. | 70060-21-8 |
| Molecular Formula | C8H6O2S2 |
| Molecular Weight | 198.26 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including 5-Methylthieno[3,2-b]thiophene-2-carboxylic acid.
5-Methylthieno[3,2-b]thiophene-2-carboxylic acid (CAS 70060-21-8) is a high-purity analytical reference standard with the molecular formula C8H6O2S2 and a molecular weight of 198.26 g/mol.
5-Methylthieno[3,2-b]thiophene-2-carboxylic acid (C8H6O2S2) contains a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system. The carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
As a certified reference material (CRM), 5-Methylthieno[3,2-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.
Physical & Chemical Properties
| Molecular Formula | C8H6O2S2 |
| Molecular Weight | 198.26 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.) | 1977 |
| Sulfur Atoms | 2 |
Related Methylthieno Standards
- 3-Methylthieno[3,2-b]thiophene-2-carboxylic acid (CAS 1901-41-3)
- 3-Methylthieno[2,3-c]isothiazole-5-carboxylic acid (CAS 82000-58-6)
- 5-methylthieno[2,3-c]isoquinoline (CAS 1558046-65-3)
- 5-methylthieno[3,2-c]isoquinoline (CAS 894102-32-0)
- 6-methylthieno[2,3-b]pyridine-2-carboxylic acid (CAS 193400-55-4)
- 5-methylthieno[2,3-b]pyridine-2-carboxylic acid (CAS 193400-56-5)
- 3-methylthieno[2,3-c]pyridine-7-carboxylic acid (CAS 2306272-59-1)
- 5-Ethyl-6-methylthieno[2,3-d]pyrimidin-4-ol (CAS 439692-89-4)
Recommended Standards
- 5-methoxy-7-methyl-3H-benzimidazole-4-carbaldehyde (CAS 2760670-75-3)
- 6-(Pyrrolidin-2-yl)quinoline (CAS 860299-05-4)
- 5-hydroxynaphthalene-1-carboxylic acid (CAS 2437-16-3)
- 6-Amino-3-Boc-3-azabicyclo[3.1.0]hexane (CAS 208837-83-6)
- 3-Iodo-7-methyl-1H-indazole (CAS 847906-27-8)
- 6-Bromo-3-(difluoromethyl)-5-methoxypicolinic acid (CAS 1805247-62-4)
- 2-Methyl-2H-thiazolo[3,2-a]pyrimidin-5(3H)-one (CAS 41200-23-1)
- (1R,2S)-2-(4-methoxyphenyl)cyclopropan-1-amine hydrochloride (CAS 26568-28-5)
- p-Hydroxybenzylpiperazine dihydrochloride (CAS 1951442-10-6)
- GSK2334470 (CAS 1227911-45-6)
- Methyl 3-amino-4-((4-chlorophenyl)sulfonyl)-5-(methylthio)thiophene-2-carboxylate (CAS 845266-18-4)
- 2-((7-(4-(Di-p-tolylamino)phenyl)benzo[c][1,2,5]thiadiazol-4-yl)methylene)malononitrile (CAS 1393343-58-2)
- 2-Ethoxy-7,7-dimethyl-10-thioxo-7,10-dihydro-[1,2]dithiolo[3,4-c]pyrrolo[3,2,1-ij]quinoline-4,5-dione (CAS 497231-43-3)
- [Tyr0] Fibrinopeptide A, human (CAS 103226-11-5)
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