Reactive Black 5 CAS 17095-24-8
| CAS No. | 17095-24-8 |
| Molecular Formula | C26H21N5O19S6 |
| Molecular Weight | N/A |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Reactive Black 5 (CAS 17095-24-8), molecular formula C26H21N5O19S6Na and molecular weight 922.82 g/mol, is a CATO reference standard with documented purity and traceability.
Reactive Black 5 (C26H21N5O19S6Na) contains a nitrogen-containing heterocyclic scaffold, an amide group, a sulfone group, a hydroxyl group, an ether linkage. It is notably hygroscopic, 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.
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 | C26H21N5O19S6 4*Na |
| Molecular Weight | 922.82 g/mol |
| Purity | Technical Grade |
| Storage | Store in a cool place (≤25°C), protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 19.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1961 |
| Nitrogen Atoms | 5 |
| Sulfur Atoms | 6 |
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Recommended Standards
- (3,4-Dichlorophenyl)(3-(morpholinomethyl)phenyl)methanone (CAS 898792-24-0)
- 1-[4-(1H-pyrazol-4-yl)phenyl]-ethanone (CAS 938461-56-4)
- 4-chloro-2-ethylthieno[2,3-d]pyrimidine (CAS 56844-11-2)
- 2-((4-Chlorophenyl)sulfonyl)-4,5-dimethyl-3,6-dihydro-2H-1,2-thiazine 1-oxide (CAS 91494-76-7)
- Methyl 5-chloronicotinate (CAS 51269-81-9)
- N-[2-(4-methoxyphenyl)ethyl]-2-(methylamino)benzamide (CAS 75652-61-8)
- 3-(Benzo[d]thiazol-2-yl)-4-(3-methoxyphenyl)-N-(4-morpholinophenyl)but-3-enamide (CAS 733795-81-8)
- 3-{[2-(2-Methoxyethoxy)ethoxy]methyl}piperidinehydrochloride (CAS 1220028-43-2)
- tert-Butyl 6-hydroxy-3,4-dihydroquinoline-1(2H)-carboxylate (CAS 327044-56-4)
- Semaglutide Impurity 146 (CAS 2645421-68-5)
Why CATO?
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