4-hydroxy-2-methylbenzenesulfonic acid CAS 7134-05-6
| CAS No. | 7134-05-6 |
| Molecular Formula | C7H8O4S |
| Molecular Weight | 188.20 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies 4-hydroxy-2-methylbenzenesulfonic acid (CAS 7134-05-6), a certified reference material (molecular formula C7H8O4S, MW 188.20 g/mol) for analytical method development and quality control.
4-hydroxy-2-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 aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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.
CATO manufactures 4-hydroxy-2-methylbenzenesulfonic acid under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C7H8O4S |
| Molecular Weight | 188.20 g/mol |
| Purity | >95% |
| 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)
- 4-Hydroxy-3-methylbenzenesulfonic Acid (CAS 7134-04-5)
- 19813-55-9 Methyl 3-hydroxy-5-methoxy-2-thiophenecarboxylate methyl 3-hydroxy-5-methoxythiophene-2-carboxylate (CAS 19813-55-9)
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Recommended Standards
- Policresulen impurity 21 (CAS 102014-39-1)
- Sivelestat Impurity 28 (CAS CATO-C4X-212328)
- Policresulen Impurity 12 (CAS 68127-34-4)
- 4-Hydrazinobenzenesulfonic Acid (CAS 98-71-5)
- 5-Fluoro-3,3-dimethyl-3H-indole (CAS 200061-84-3)
- 3,5-Dimethoxy-4-vinylbenzaldehyde (CAS 1822848-23-6)
- 3-bromo-1,1-difluorocyclobutane (CAS 1310729-91-9)
- [5-(furan-2-yl)-1,2,4-oxadiazol-3-yl]methanamine hydrochloride (CAS 1609400-88-5)
- 3,4'-Bipyridine (CAS 4394-11-0)
- Cariprazine Impurity 26 (CAS CATO-C4X-240826)
- (E)-3-(3-chloro-5-fluoro-4-methoxyphenyl)acrylic acid (CAS 886501-39-9)
- (Propylthio)acetic acid (CAS 20600-60-6)
- 2-Amino-4-(3,4-difluorophenyl)-5H-indeno[1,2-d]pyrimidin-5-one (CAS 713514-76-2)
- Semaglutide impurity 91 (CAS CATO-C4X-222691)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com