3,5-Dichloro-2-methoxybenzene-1-sulfonyl chloride CAS 19116-94-0
| CAS No. | 19116-94-0 |
| Molecular Formula | C7H5Cl3O3S |
| Molecular Weight | 275.54 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
3,5-Dichloro-2-methoxybenzene-1-sulfonyl chloride (CAS 19116-94-0), molecular formula C7H5Cl3O3S and molecular weight 275.54 g/mol, is a CATO reference standard with documented purity and traceability.
3,5-Dichloro-2-methoxybenzene-1-sulfonyl chloride (C7H5Cl3O3S) contains a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, chlorine substitution, an aromatic ring system. It is notably hygroscopic, halogen substitution raises its density and boiling point, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
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.
Physical & Chemical Properties
| Molecular Formula | C7H5Cl3O3S |
| Molecular Weight | 275.54 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.) | 1962 |
| Halogen Content | Cl-containing |
| Sulfur Atoms | 1 |
Related Dichloro Standards
- 3,4-Dichloro-2-methoxybenzene-1-sulfonyl chloride (CAS 1246776-77-1)
- 2,3-Dichloro-4-methoxybenzene-1-sulfonyl chloride (CAS 35509-60-5)
- 2,5-Dichloro-4-methoxybenzenesulfonyl chloride (CAS 35509-62-7)
- 3,5-Dichloro-4-methoxybenzenesulfonyl chloride (CAS 35517-53-4)
- 4,5-Dichloro-2-(3-chlorophenyl)pyridazin-3(2h)-one (CAS 41931-11-7)
- 4,5-Dichloro-2-(4-chlorophenyl)pyridazin-3-one (CAS 33098-11-2)
- 3,4-Dichloro-2-(difluoromethoxy)benzoyl chloride (CAS 1803713-42-9)
- 2,3-Dichloro-6-(difluoromethoxy)benzoyl chloride (CAS 1803789-10-7)
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