1-Naphthol-4-sulfonic acid
- CAS NO.:84-87-7
- Empirical Formula: C10H8O4S
- Molecular Weight: 224.23
- MDL number: MFCD00065324
- EINECS: 201-568-4
- SAFETY DATA SHEET (SDS)
- Update Date: 2024-05-31 17:33:32
What is 1-Naphthol-4-sulfonic acid ?
Chemical properties
Transparent flake crystal. soluble in water. 1-Hydroxynaphthalene- 4 -sulfonic acid [84-87-7]. (4-hydroxynaphthalene-1-sulfonic acid), Nevile and Winther’s acid, NW acid, C10H8O4S, Mr 224.23, and its salts are water soluble, but the sodium salt may be precipitated from solution by salting out. Coupling with diazo compounds takes place in the 2-position. Nitration yields 2,4-dinitro-1-naphthol, whereas nitrosation gives 2-nitroso-1-hydroxynaphthalene-4-sulfonic acid. Sulfonation leads to a mixture of 1-hydroxynaphthalene-2,4-di- and 2,4,7- trisulfonic acids.
The Uses of 1-Naphthol-4-sulfonic acid
1-Naphthol-4-sulfonic acid is used as an intermediate of azo dyes to prepare dyes such as direct copper blue BR and 2R, direct violet RB, acid red B and acid medium jujube red B
Preparation
After drying under vacuum, the resulting filter cake contains 1-naphthol-4-sulphonic acid in a yield of 92% of theory and <0.5% 1-naphthol-2-sulphonic acid and 3% of 1-naphthol-2,4-disulphonic acid based on the weight of 1-naphthol-4-sulphonic acid.
Synthesis
1-Naphthol-4-sulfonic acid was synthesized by addition, hydrolysis and acid precipitation of sodium 1,4-aminonaphthalene sulfonate.
Properties of 1-Naphthol-4-sulfonic acid
Melting point: | 170℃ |
Boiling point: | 335.63°C (rough estimate) |
Density | 1.4643 (rough estimate) |
refractive index | 1.7040 (estimate) |
pka | 0.73±0.40(Predicted) |
form | solid |
form | solid |
color | white to yellow |
InChI | InChI=1S/C10H8O4S/c11-9-5-6-10(15(12,13)14)8-4-2-1-3-7(8)9/h1-6,11H,(H,12,13,14) |
CAS DataBase Reference | 84-87-7(CAS DataBase Reference) |
EPA Substance Registry System | 1-Naphthalenesulfonic acid, 4-hydroxy- (84-87-7) |
Safety information for 1-Naphthol-4-sulfonic acid
Signal word | Warning |
Pictogram(s) |
Exclamation Mark Irritant GHS07 |
GHS Hazard Statements |
H302:Acute toxicity,oral H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation |
Precautionary Statement Codes |
P261:Avoid breathing dust/fume/gas/mist/vapours/spray. 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 1-Naphthol-4-sulfonic acid
InChIKey | HGWQOFDAUWCQDA-UHFFFAOYSA-N |
SMILES | C1(S(O)(=O)=O)=C2C(C=CC=C2)=C(O)C=C1 |
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