5-Bromo-2-methoxy-4-methylbenzenesulfonic acid CAS 223438-71-9
| CAS No. | 223438-71-9 |
| Molecular Formula | C8H9BrO4S |
| Molecular Weight | 281.12 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies 5-Bromo-2-methoxy-4-methylbenzenesulfonic acid (CAS 223438-71-9), a certified reference material (molecular formula C8H9BrO4S, MW 281.12 g/mol) for analytical method development and quality control.
5-Bromo-2-methoxy-4-methylbenzenesulfonic acid (C8H9BrO4S) contains a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, bromine 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. 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.
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 | C8H9BrO4S |
| Molecular Weight | 281.12 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 |
| 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.) | 2020 |
| Halogen Content | Br-containing |
| Sulfur Atoms | 1 |
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- 1-Bromo-2-((4-fluorophenoxy)methyl)benzene (CAS 1247490-36-3)
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Recommended Standards
- 4-(Bromomethyl)-1-fluoro-2-phenoxybenzene (CAS 68359-55-7)
- 5-Bromo-2-methoxyphenyl methanesulfonate (CAS 871571-19-6)
- 3-Bromophenyl-(4-fluorobenzyl)ether (CAS 845866-52-6)
- Methyl 3-bromo-4-methoxybenzenesulfonate (CAS 363587-94-4)
- 3-(3-(Bromomethyl)-5-iodophenyl)-3-(trifluoromethyl)-3H-diazirine (CAS 309250-32-6)
- 5-Methyl-2-(5-nitrofuran-2-yl)-1H-benzo[d]imidazole (CAS 113608-76-7)
- N-methyloctahydro-2H-quinolizin-1-amine (CAS 1423030-94-7)
- 2-Tosylethan-1-amine hydrochloride (CAS 1093405-12-9)
- Probucol Impurity 6 (CAS CATO-C4X-29206)
- 5-Nitro-2-(1H-pyrrol-1-yl)benzonitrile (CAS 106981-59-3)
- 2-((Diisobutylamino)methyl)benzaldehyde (CAS 1443355-63-2)
- RPL 554 (CAS 298680-25-8)
- 2-[[(tert-Butoxycarbonyl)amino]methyl]-5-fluorobenzoic acid (CAS 606080-59-5)
- 59880-97-6 Chemotactic peptide F-Met-Leu-Phe L-Phenylalanine, N-(N-(N-formyl-L-methionyl)-L-leucyl)- N-Formyl-L-methionyl-L-leucyl-L-phenylalanine N-Formyl-Met-Leu-Phe N-Formylmethionine leucyl-phenylalanine fMLF fMLP (misnomer but widely used) (CAS 59880-97-6)
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