3-Chloro-4-methoxybenzenesulfonic acid CAS 118795-71-4
| CAS No. | 118795-71-4 |
| Molecular Formula | C7H7ClO4S |
| Molecular Weight | 222.65 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The molecular framework of 3-Chloro-4-methoxybenzenesulfonic acid (C7H7ClO4S) is characterized by a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, chlorine substitution, an aromatic ring system. In reversed-phase chromatography, its retention is governed primarily by the polarity and ionization state of its functional groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
3-Chloro-4-methoxybenzenesulfonic acid (CAS 118795-71-4), molecular formula C7H7ClO4S and molecular weight 222.65 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.
As a certified reference material (CRM), 3-Chloro-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 | C7H7ClO4S |
| Molecular Weight | 222.65 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.) | 1990 |
| Halogen Content | Cl-containing |
| Sulfur Atoms | 1 |
Related Chloro Standards
- 4-Chloro-5-fluoro-6-methyl-2-phenylpyrimidine (CAS 1000931-50-9)
- 4-Chloro-2-[(4-fluorophenyl)methyl]pyrimidine (CAS 1156238-27-5)
- 4-chloro-6-(2-fluorophenyl)-2-methylpyrimidine (CAS 1159816-02-0)
- 3-Chloro-6-(2-fluorophenyl)-4-methylpyridazine (CAS 118270-17-0)
- 4-Chloro-2-(2-fluorophenyl)-6-methylpyrimidine (CAS 1188233-71-7)
- 2-Chloro-6-methoxypyridine-3-sulfonamide (CAS 1208081-15-5)
- 4-chloro-6-(3-fluorophenyl)-2-methylpyrimidine (CAS 1256638-62-6)
- 5-(3-Chloro-4-fluorophenyl)pyridin-2-amine (CAS 1314985-70-0)
Recommended Standards
- (5-Methoxypyrazin-2-yl)methanesulfonyl chloride (CAS 1196146-01-6)
- (2-Methoxypyrimidin-5-yl)methanesulfonyl chloride (CAS 1196155-67-5)
- 2-(4-(Chloromethyl)phenyl)-5-fluoropyrimidine (CAS 1139432-30-6)
- Methyl 3-(4-chlorophenyl)-2-isocyanopropanoate (CAS 120314-12-7)
- 2-Amino-4,5-dimethoxypyrimidine (CAS 4763-53-5)
- 2-Dodecyl-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (CAS 177035-82-4)
- Allyl 3,4-diaminobenzoate (CAS 273939-71-2)
- Naphthalene-1-Aldehyde (CAS 66-77-3)
- 9,9´-Bis[xanthenyliden] (CAS 517-45-3)
- 1-(6-Amino-5-bromo-1H-indol-1-yl)ethan-1-one (CAS 1000343-17-8)
- 7-ACCA Impurity 4 (CAS CATO-C4X-23134)
- N-(2-(4-(ethoxycarbonyl)piperidin-1-yl)-2-oxoethyl)-N-phenylglycine (CAS 1142211-83-3)
- 4H-1,2,4-Triazole-3-sulfonyl fluoride (CAS 78201-15-7)
- Semaglutide impurity 49 (CAS CATO-C4X-222649)
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