4-Hydroxy-7-methylamino-2-naphthalenesulfonic acid
- CAS NO.：22346-43-6
- Empirical Formula: C11H11NO4S
- Molecular Weight: 253.27
- MDL number: MFCD00128846
- EINECS: 244-924-4
- Update Date: 2026-05-28 02:49:15
What is 4-Hydroxy-7-methylamino-2-naphthalenesulfonic acid?
Chemical properties
4-Hydroxy-7-methylaminonaphthalene-2- sulfonic acid [22346-43-6], N-methyl J acid, is produced by reaction of 2,5-dihydroxynaphthalene-7-sulfonic acid with methylamine and aqueous sodium bisulfite at 96 C for 36 h (yield 83 %). It is used to produce C.I. Reactive Orange 4, C.I. Reactive Orange 13, and C.I. Reactive Red 33.
Properties of 4-Hydroxy-7-methylamino-2-naphthalenesulfonic acid
| Density | 1.542 |
| refractive index | 1.4790 (estimate) |
| storage temp. | 2-8°C |
| pka | -0.14±0.40(Predicted) |
| color | Very dark brown |
| CAS DataBase Reference | 22346-43-6(CAS DataBase Reference) |
| EPA Substance Registry System | 2-Naphthalenesulfonic acid, 4-hydroxy-7-(methylamino)- (22346-43-6) |
Safety information for 4-Hydroxy-7-methylamino-2-naphthalenesulfonic acid
| Signal word | Warning |
| Pictogram(s) |
 Exclamation Mark Irritant GHS07 |
| GHS Hazard Statements |
H302:Acute toxicity,oral |
| Precautionary Statement Codes |
P280:Wear protective gloves/protective clothing/eye protection/face protection. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. |
Computed Descriptors for 4-Hydroxy-7-methylamino-2-naphthalenesulfonic acid
4-Hydroxy-7-methylamino-2-naphthalenesulfonic acid manufacturer
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