3-((4-Amino-3-methoxyphenyl)diazenyl)benzenesulfonic acid CAS 138-28-3
Purity 97%+In StockPharmaceutical Standards
| CAS No. | 138-28-3 |
| Molecular Formula | C13H13N3O4S |
| Molecular Weight | 307.33 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
3-((4-Amino-3-methoxyphenyl)diazenyl)benzenesulfonic acid (CAS 138-28-3) reference standard, produced by CATO (ISO 17034 / CNAS / ANAB accredited). Molecular formula: C13H13N3O4S. Molecular weight: 307.33 g/mol. Trusted by 10,000+ laboratories worldwide for pharmaceutical analysis and QC.
Physical & Chemical Properties
| Molecular Formula | C13H13N3O4S |
| Molecular Weight | 307.33 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 9.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
| Nitrogen Atoms | 3 |
| Sulfur Atoms | 1 |
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Recommended Standards
- tert-butyl 3,3-difluoro-4-(3-methoxy-3-oxo-propyl)piperidine-1-carboxylate (CAS 1373503-82-2)
- 2-(4-Methylphenylsulfonamido)-N-(1,2,4-triazin-3-yl)acetamide (CAS 138598-40-0)
- Ethyl 4,5-dihydrobenzo[f]imidazo[5,1-d][1,2,5]thiadiazepine-3-carboxylate 6,6-dioxide (CAS 1341037-76-0)
- (3aR,5r,6aS)-rel-2-Methyloctahydrocyclopenta[c]pyrrol-5-amine (CAS 160080-13-7)
- 3-Bromo-5-iodo-2-methoxypyridin-4-amine (CAS 1227268-98-5)
- 4-{[(pyridin-4-yl)amino]methyl}benzoic acid (CAS 62642-68-6)
- (R)-2-(2,6-Difluorobenzyl)piperazine (CAS 1240589-45-0)
- Pyrroloquinoline Impurity 1 (CAS 119825-27-3)
- 2-Isobutyl-4,5,6,7-tetrahydro-2H-pyrazolo[4,3-c]pyridin-3-ol (CAS 1708401-36-8)
- Peptide Impurity 70 TFA Salt (CAS CATO-CPTD788570)
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