2-Bromo-5-methylbenzenesulfonic acid CAS 56919-22-3
| CAS No. | 56919-22-3 |
| Molecular Formula | C7H7BrO3S |
| Molecular Weight | 251.10 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
CATO supplies 2-Bromo-5-methylbenzenesulfonic acid (CAS 56919-22-3), a certified reference material (molecular formula C7H7BrO3S, MW 251.10 g/mol) for analytical method development and quality control.
Owing to a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, bromine substitution, an aromatic ring system, 2-Bromo-5-methylbenzenesulfonic acid is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 251.10 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).
As a certified reference material (CRM), 2-Bromo-5-methylbenzenesulfonic 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 | C7H7BrO3S |
| Molecular Weight | 251.10 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.) | 1973 |
| Halogen Content | Br-containing |
| Sulfur Atoms | 1 |
Related Bromo Standards
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Recommended Standards
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- 1858256-76-4 1-[(4-Methylbenzyl)sulfonyl]piperidine-4-carboxylic acid MFCD28954574 (CAS 1858256-76-4)
- (4-Methoxy-3,5-dimethylpyridin-2-yl)methanamine (CAS 130000-78-1)
- 2-(2,5-Dimethylphenyl)-8-methylimidazo[1,2-a]pyridine (CAS 881040-62-6)
- 1-(4-Methyl-1H-imidazol-2-yl)ethane-1,2-diol (CAS 790642-46-5)
- Sulbenox (CAS 58095-31-1)
- 6-Amino-4-bromo-3-fluoro-2-nitrotoluene (CAS 1427502-98-4)
- Tau Peptide (273-284) trifluoroacetate salt (CAS 1663490-91-2)
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