Benzenesulfonate Impurity 4 CAS 309915-56-8
| CAS No. | 309915-56-8 |
| Molecular Formula | C9H12O5S |
| Molecular Weight | 232.25 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Owing to a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system, Benzenesulfonate Impurity 4 is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 232.25 g/mol — guide the selection of appropriate sample preparation and analytical techniques. 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).
Benzenesulfonate Impurity 4 (CAS 309915-56-8) is a certified pharmaceutical impurity reference standard with the molecular formula C9H12O5S and a molecular weight of 232.25 g/mol.
This reference standard supports related-substances testing and method development in line with ICH Q3A/Q3B guidance on impurity control, and is suitable for system suitability testing and forced-degradation studies.
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 | C9H12O5S |
| Molecular Weight | 232.25 g/mol |
| Purity | >95% |
| Storage | Store in a cool place (≤25°C), keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2025 |
| Sulfur Atoms | 1 |
Related Benzenesulfonate Standards
- Benzenesulfonate Impurity 5 (CAS CATO-C4X-28175)
- Phenyl benzenesulfonate (CAS 4358-63-8)
- Benzyl Benzenesulfonate (CAS 38632-84-7)
- Butyl Benzenesulfonate (CAS 80-44-4)
- Propyl benzenesulfonate (CAS 80-42-2)
- Ethyl Benzenesulfonate (CAS 515-46-8)
- Methyl Benzenesulfonate (CAS 80-18-2)
- Benzenesulfonate (CAS 3198-32-1)
Recommended Standards
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