4-Hydroxy-3-methylbenzenesulfonic Acid CAS 7134-04-5
| CAS No. | 7134-04-5 |
| Molecular Formula | C7H8O4S |
| Molecular Weight | 188.20 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
4-Hydroxy-3-methylbenzenesulfonic Acid (C7H8O4S) contains a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system. It is notably hygroscopic, 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).
4-Hydroxy-3-methylbenzenesulfonic Acid (CAS 7134-04-5), molecular formula C7H8O4S and molecular weight 188.20 g/mol, is a CATO reference standard with documented purity and traceability.
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 | C7H8O4S |
| Molecular Weight | 188.20 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO, water |
| 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.) | 1959 |
| Sulfur Atoms | 1 |
Related Hydroxy Standards
- 2-Hydroxy-5-methylbenzenesulfonic Acid (CAS 7134-06-7)
- 19813-55-9 Methyl 3-hydroxy-5-methoxy-2-thiophenecarboxylate methyl 3-hydroxy-5-methoxythiophene-2-carboxylate (CAS 19813-55-9)
- 2-Hydroxy-4-methylbenzenesulfonic acid (CAS 22356-80-5)
- 4-hydroxy-2-methylbenzenesulfonic acid (CAS 7134-05-6)
- Hydroxy Ipronidazole-d3 (CAS 1156508-86-9)
- 7-Hydroxy-5,6-dimethylpyrazolo[1,5-a]pyrimidine-3-carbonitrile (CAS 1310199-27-9)
- 3-Hydroxy-2-oxo-1,2,3,4-tetrahydroquinoline-7-carbonitrile (CAS 1033747-92-0)
- 2-(4-Hydroxy-2-oxoindolin-3-yl)acetonitrile (CAS 1380540-77-1)
Recommended Standards
- 4-Fluoro-2-(pyridin-3-yl)benzenamine (CAS 923293-16-7)
- 4-Hydroxybenzenesulfonohydrazide (CAS 5907-00-6)
- 4-fluoro-1H-indazole-3-carboxylic acid (CAS 885521-64-2)
- 4-Methoxybenzenesulfonic Acid (CAS 5857-42-1)
- 4-Hydroxy-1-[2-(trifluoromethyl)phenyl]-1h-pyrazole-3-carbohydrazide (CAS 957014-21-0)
- 5-{[(4-methoxyphenyl)methyl]amino}-2,3-dihydro-1H-1,3-benzodiazol-2-one (CAS 884993-54-8)
- 2-(2,2-Difluoroethoxy)-3-fluorobenzenamine (CAS 1566580-28-6)
- 1-(5-Methyl-1H-pyrazol-1-yl)ethan-1-one (CAS 114906-08-0)
- Methyl 5-bromo-4-cyano-2-hydroxybenzoate (CAS 1804381-61-0)
- 4-Bromo-1-(difluoromethyl)-1H-pyrazol-3-amine (CAS 1342073-67-9)
- 4,6-Dimethyl-3-(phenylsulfonyl)pyridin-2-yl 2,3,6-trifluorobenzoate (CAS 338953-81-4)
- Cefpirome Impurity 24 (CAS CATO-C4X-120724)
- 7-chloro-2-methyl-6H-imidazo[1,2-c]pyrimidin-5-one (CAS 1059191-51-3)
- Pancreatic Polypeptide (rat) (CAS 90419-12-8)
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