4-Methoxybenzenesulfonic Acid CAS 5857-42-1
| CAS No. | 5857-42-1 |
| Molecular Formula | C7H8O4S |
| Molecular Weight | 188.20 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of 4-Methoxybenzenesulfonic Acid is closely related to a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
4-Methoxybenzenesulfonic Acid (CAS 5857-42-1), molecular formula C7H8O4S and molecular weight 188.20 g/mol, is a CATO reference standard with documented purity and traceability.
Structurally, 4-Methoxybenzenesulfonic Acid (C7H8O4S) contains a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system. The molecule exhibits a degree of unsaturation (DBE) of 4.0, corresponding to approximately 4 ring(s) or double-bond equivalent(s). With a molecular weight of 188.20 g/mol, it falls into the medium-molecular-weight range. 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).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
As a certified reference material (CRM), 4-Methoxybenzenesulfonic 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 | 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.) | 1958 |
| Sulfur Atoms | 1 |
Related Methoxybenzenesulfonic Standards
Recommended Standards
- 4-Hydroxybenzenesulfonohydrazide (CAS 5907-00-6)
- 5-(2-Fluorophenyl)pyridin-2-amine (CAS 893739-85-0)
- 4-Hydroxy-3-methylbenzenesulfonic Acid (CAS 7134-04-5)
- 5-(3-Fluorophenyl)pyridin-2-amine (CAS 866620-27-1)
- 2-Cyano-3-(3-methoxyphenyl)propiophenone (CAS 898774-49-7)
- 4-(4-(4-Bromophenyl)-5-((naphthalen-1-ylmethyl)thio)-4H-1,2,4-triazol-3-yl)pyridine (CAS 676643-89-3)
- 1-(2-Nitrophenyl)-5-(thiophen-2-yl)-1H-pyrazole (CAS 1269293-17-5)
- 7-Methoxy-1H-indol-4-amine (CAS 511231-89-3)
- 3-(2-Benzoxazolyl)umbelliferylacetate (CAS 97004-78-9)
- N-Phenethylbenzofuran-2-carboxamide (CAS 50635-14-8)
- 4-((Thiophen-2-ylmethyl)amino)quinazolin-2(1H)-one (CAS 1031970-30-5)
- 2,2',3,3',4,5,5',6-Octabromodiphenylether, 50μg/mLin Isooctane',3,3', (CAS 446255-42-1)
- (3E)-3-[(4-Methoxyphenyl)imino]-1-methyl-2,3-dihydro-1H-indol-2-one (CAS 80110-10-7)
- D-Ala18-Tirzepatide (CAS CATO-CPTD788916)
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