5-Methylisoxazole-4-sulfonic acid CAS 773051-56-2
| CAS No. | 773051-56-2 |
| Molecular Formula | C4H5NO4S |
| Molecular Weight | 163.15 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
5-Methylisoxazole-4-sulfonic acid (CAS 773051-56-2), molecular formula C4H5NO4S and molecular weight 163.15 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to a carbohydrate-derived structure, an amide group, a sulfone group, 5-Methylisoxazole-4-sulfonic acid is typically white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 163.15 g/mol — guide the selection of appropriate sample preparation and analytical techniques. 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).
CATO manufactures 5-Methylisoxazole-4-sulfonic 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 | C4H5NO4S |
| Molecular Weight | 163.15 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO, water |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 3.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1986 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related Methylisoxazole Standards
- 3-Methylisoxazole-4-sulfonic acid (CAS 747406-57-1)
- 5-Methylisoxazole-3,4-dicarboxamide (CAS 400077-37-4)
- 3-Ethyl-5-methylisoxazole-4-carbohydrazide (CAS 1094733-72-8)
- 3-Ethyl-5-methylisoxazole-4-carboxylic acid (CAS 17147-85-2)
- 3-Ethyl-4-methylisoxazole-5-carboxylic acid (CAS 874289-75-5)
- Ethyl 3-methylisoxazole-4-carboxylate (CAS 20328-15-8)
- Ethyl 4-methylisoxazole-3-carboxylate (CAS 38061-69-7)
- Ethyl 4-methylisoxazole-5-carboxylate (CAS 261350-50-9)
Recommended Standards
- 5-Fluoroquinolin-4(1H)-one (CAS 386-68-5)
- 6-Fluoro-1H-indole-2-carbaldehyde (CAS 933746-81-7)
- 5-Fluoroquinolin-2-ol (CAS 643752-95-8)
- 6-Fluoro-1H-indole-7-carbaldehyde (CAS 603309-90-6)
- (Z)-5,6-Dimethyl-2-((4-(3-(piperidin-1-ylmethyl)phenoxy)but-2-en-1-yl)amino)pyrimidin-4(1H)-one dihydrochloride (CAS 126869-04-3)
- Benzyl (1-(oxetan-3-yl)piperidin-4-yl)carbamate (CAS 1349716-55-7)
- N-(2-Ethoxyphenyl)-3-(4-hydroxy-3-methoxyphenyl)-2-(2H-1,2,3,4-tetrazol-5-yl)propanamide (CAS 483995-87-5)
- Gadobutrol Impurity 35 (CAS 52667-88-6)
- (2,6-Dichloro-4-(trifluoromethyl)phenyl)boronic acid (CAS 1887240-36-9)
- trans-4-(Piperidin-1-yl)pyrrolidin-3-ol (CAS 1018443-35-0)
- 1-(6-Methylpyridin-2-yl)piperazine dihydrochloride (CAS 120144-91-4)
- 2-(5,5-Dimethyl-1,3,2-dioxaborinan-2-yl)aniline (CAS 532924-29-1)
- (S)-1-[(S)-1-Phenylethyl]pyrrolidine-3-methanol (CAS 173724-95-3)
- Insulin Degludec Impurity 24 (CAS CATO-C4X-215724)
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