3,5-Dichlorobenzenesulfonic acid CAS 33469-47-5
| CAS No. | 33469-47-5 |
| Molecular Formula | C6H4Cl2O3S |
| Molecular Weight | 227.07 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
3,5-Dichlorobenzenesulfonic acid (C6H4Cl2O3S) contains a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, chlorine substitution, an aromatic ring system. It is notably hygroscopic, halogen substitution raises its density and boiling point, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. 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).
3,5-Dichlorobenzenesulfonic acid (CAS 33469-47-5), molecular formula C6H4Cl2O3S and molecular weight 227.07 g/mol, is a CATO reference standard with documented purity and traceability.
This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.
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 | C6H4Cl2O3S |
| Molecular Weight | 227.07 g/mol |
| Purity | 97%+ |
| Storage | Store in a cool place (≤25°C), keep sealed and dry, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO, water |
| Stability | May oxidize slowly on prolonged air exposure; Hygroscopic; reseal immediately after opening; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1966 |
| Halogen Content | Cl-containing |
| Sulfur Atoms | 1 |
Related Dichlorobenzenesulfonic Standards
Recommended Standards
- 3-Bromo-5-(difluoromethyl)-2-methylthiophene (CAS 2091602-53-6)
- 2-Bromo-7-fluorotricyclo[6.2.0.03,6]deca-1,3(6),7-triene (CAS 2676868-20-3)
- 3-Chloro-4-hydroxybenzenesulfonyl chloride (CAS 25319-94-2)
- 2,6-Dichlorobenzene Sulphonic acid (CAS 6697-96-7)
- (S)-6-ethyl-2,3-dihydro-1H-inden-1-amine (CAS 1213353-97-9)
- xanthopurpurin (CAS 518-83-2)
- Napitane (CAS 148152-63-0)
- Artemether (CAS 71963-77-4)
- 6,7-Dihydro-4H-pyrano[4,3-d]thiazole (CAS 259810-14-5)
- N-Benzyl-N-[1-(4-bromophenyl)-2,5-dioxopyrrolidin-3-yl]-2-chloroacetamide (CAS 1858241-22-1)
- 4-[1-(2-Methoxy-ethyl)-1H-indol-3-yl]-thiazol-2-ylamine (CAS 878046-69-6)
- 2-Methyl-2-(methylamino)propanoic acid hydrochloride (CAS 1223405-15-9)
- (1R,2S)-ethyl 2-(3-amino-4-(diisobutylamino)phenyl)cyclopropanecarboxylate (CAS 1629126-20-0)
- Tirzepatide Impurity 47 (CAS CATO-C4X-324047)
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