APS
3-Amino-4-hydroxybenzenesulfonic acid
CAS: 98-37-3
Molecular Formula: C6H7NO4S
APS - Names and Identifiers
APS - Physico-chemical Properties
| Molecular Formula | C6H7NO4S |
| Molar Mass | 189.19 |
| Density | 1.5149 (rough estimate) |
| Melting Point | ≥300°C(lit.) |
| Boling Point | 398.09℃[at 101 325 Pa] |
| Water Solubility | <0.1 g/100 mL at 21.5 ºC |
| Vapor Presure | 0Pa at 25℃ |
| Appearance | powder to crystal |
| Color | Orange to Amber to Dark red |
| BRN | 514765 |
| pKa | -0.81±0.50(Predicted) |
| Storage Condition | Keep in dark place,Sealed in dry,Room Temperature |
| Stability | Stable. Incompatible with strong oxidizing agents, strong acids and strong bases. |
| Refractive Index | 1.5500 (estimate) |
| MDL | MFCD00007696 |
| Physical and Chemical Properties | The pure product was colorless to gray-brown rhomboid crystals. soluble in hot water, soluble in alkaline solution. |
| Use | Used as a dye intermediate |
APS - Risk and Safety
| Hazard Symbols | C - Corrosive |
| Risk Codes | 34 - Causes burns |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) |
| UN IDs | UN 2585 8/PG 3 |
| WGK Germany | 1 |
| Hazard Class | 8 |
| Packing Group | III |
APS - Reference
| Reference Show more | 1. Wu, F. H., K. Chen, and D. K. Zhang. "Effects of Astragalus polysaccharide on immune function in B16 melanoma mice." TMR Integr Med 5 (2021): e21012.https://www.tmrjournals.com/im |
APS - Nature
Open Data Verified Data
gray-white or light-brown feather-like crystals. The melting point was above 195 °c. Slightly soluble in water, soluble in acid and alkali, placed in the air gradually darkened color.
Last Update：2025-06-10 22:55:16
APS - Preparation Method
Open Data Verified Data
O-nitrochlorobenzene is chlorosulfonated with chlorosulfonic acid to give 4-chlorosulfonyl-2-nitrochlorobenzene, and then aminated to give 4-sulfonamido-2-nitrochlorobenzene, then, the sodium salt of 4-sulfonamido-2-nitrophenol is hydrolyzed into 4-sulfonamido-2-nitrophenol, acidified with hydrochloric acid, and reduced in the presence of iron powder to obtain a finished product.
Last Update：2022-01-01 10:55:40
APS - Introduction
Soluble in hot water, easily soluble in lye, solubility in cold water about 1%. With ferric chloride, it becomes cherry red and then turns brown.
Last Update：2022-10-16 17:30:27
APS - Application
Open Data Verified Data
The diazo component used as a neutral dye.
Last Update：2025-08-19 16:24:40
APS - Safety
Open Data Verified Data
- This product belongs to sulfonamides, toxic. Oral administration can cause loss of appetite, Nausea, Vomit, Diarrhea and other side effects, can cause adverse effects on the liver, kidney and so on. Operators should wear protective equipment, equipment should be sealed.
- the use of lined plastic bags, external use of wood or paper drum packaging. 50kg per barrel. According to the provisions of toxic substances storage and transportation.
Last Update：2025-06-10 22:55:16
APS - Reference Information
| LogP | -2.56 at 25℃ |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Application | used as dye intermediate used as dye intermediate for the production of acid medium orange LR, acid medium violet, active purple K-3R, direct sun-resistant Brown BRL, etc. |
| production method | from O-nitrophenol to sulfonic acid by reduction of iron powder or hydrogenation reduction. |
Last Update：2024-04-09 21:32:09
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