4-Nitrothieno[2,3-b]pyridine 7-oxide CAS 25557-51-1
| CAS No. | 25557-51-1 |
| Molecular Formula | C7H4N2O3S |
| Molecular Weight | 196.18 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
4-Nitrothieno[2,3-b]pyridine 7-oxide (CAS 25557-51-1) is a high-purity analytical reference standard with the molecular formula C7H4N2O3S and a molecular weight of 196.18 g/mol.
Owing to an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system, 4-Nitrothieno[2,3-b]pyridine 7-oxide is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 196.18 g/mol — guide the selection of appropriate sample preparation and analytical techniques. 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), 4-Nitrothieno[2,3-b]pyridine 7-oxide 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 | C7H4N2O3S |
| Molecular Weight | 196.18 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO, water |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1964 |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 1 |
Related Nitrothieno Standards
- 7-Nitrothieno[3,2-b]pyridine 4-oxide (CAS 104273-28-1)
- 6-Nitrothieno[3,2-b]pyridin-7(4H)-one (CAS 905735-40-2)
- 2-Nitrothieno[2,3-b]pyridin-3-amine (CAS 52505-49-4)
- 6-Nitrothieno[2,3-d]pyrimidin-4-ol (CAS 56844-41-8)
- 7-Nitrothieno[3,2-b]pyridine (CAS 104273-31-6)
- 3-Nitrothieno[2,3-c]pyridine (CAS 28783-28-0)
- 3-Nitrothieno[3,2-b]pyridine (CAS 26579-59-9)
Recommended Standards
- 4-Fluoro-2-methoxycinnamic acid (CAS 682804-98-4)
- 4-Oxo-1,4-dihydrothieno[2,3-d]pyrimidine-6-carboxylic acid (CAS 439693-47-7)
- 4-(Allyloxy)-3-fluorobenzoic acid (CAS 445026-40-4)
- 5-(2-Thiazolyl)isoxazole-3-carboxylic Acid (CAS 933759-69-4)
- N-(2-Chloro-5-fluoropyrimidin-4-yl)hydroxylamine (CAS 1378583-02-8)
- 4-Chloro-2-cyclopropyl-6-(2-(trifluoromethyl)phenyl)pyrimidine (CAS 1159819-79-0)
- 2-Methyl-3-(5-methylfuran-2-carboxamido)propanoic acid (CAS 1250364-01-2)
- N-(6-(1H-Pyrazol-1-yl)pyrimidin-4-yl)-2-(1H-1,2,4-triazol-1-yl)acetamide (CAS 1428367-06-9)
- 2-(6-Chloro-3-(difluoromethyl)-5-(trifluoromethyl)pyridin-2-yl)acetonitrile (CAS 1806070-63-2)
- 1-Ethynyl-3-methylbenzene 3-Ethynyltoluene 766-82-5 E0665 m-Tolylacetylene (CAS 766-82-5)
- 2-Methyl-1,7-naphthyridine (CAS 61523-57-7)
- 1-[5-[1-(tert-Butoxy)ethyl]-1-(3-fluoro-4-methylbenzyl)-2-piperazinyl]-1-ethanol (CAS 1353505-79-9)
- 2-Chloro-6-(difluoromethyl)pyridine (CAS 1026587-36-9)
- Urotensin II-Related Peptide (human, mouse, rat) (CAS 342878-90-4)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com