81-05-0
2-aminonaphthalene-5-sulfonic acid
CAS: 81-05-0
Molecular Formula: C10H9NO3S
81-05-0 - Names and Identifiers
| Name | 2-aminonaphthalene-5-sulfonic acid |
| Synonyms | D ACID Gycolan Green BFL 2-Naphthylamine-5-sulfonic acid 6-aminonaphthalene-1-sulfonic acid BETA-NAPHTHYLAMINE-5-SULFONIC ACID 2-AMINONAPHTHALENE-5-SULFONIC ACID 6-Amino-1-naphthalenesulfonic acid 2-Amino-5-naphthalenesulfonic acid 2-aminonaphthalene-5-sulfonic acid 6-aminonaphthalene-1-sulphonic acid 6-azanylnaphthalene-1-sulfonic acid 6-Aminonaphthalene-1-sulphonic acid 1-Naphthalenesulfonic acid, 6-amino- Dahl's Acid2-Naphthylamine-5-sulfonic Acid |
| CAS | 81-05-0 |
| EINECS | 201-318-4 |
| InChI | InChI=1/C10H9NO3S/c11-8-4-5-9-7(6-8)2-1-3-10(9)15(12,13)14/h1-6H,11H2,(H,12,13,14) |
81-05-0 - Physico-chemical Properties
| Molecular Formula | C10H9NO3S |
| Molar Mass | 223.25 |
| Density | 1.3588 (rough estimate) |
| Water Solubility | 0.33g/L(20 ºC) |
| Appearance | powder to crystal |
| Color | White to Light yellow to Light red |
| Merck | 14,6407 |
| pKa | -0.33±0.40(Predicted) |
| Storage Condition | under inert gas (nitrogen or Argon) at 2–8 °C |
| Refractive Index | 1.6500 (estimate) |
| MDL | MFCD00035724 |
| Physical and Chemical Properties | White needle-like crystals. Slightly soluble in water. |
81-05-0 - Risk and Safety
| UN IDs | 1759 |
| HS Code | 29269095 |
| Hazard Class | 8 |
| Packing Group | III |
81-05-0 - Reference Information
| Use | for the preparation of acid dyes used as dye intermediates. |
| production method | is obtained by sulfonation of β-naphthylamine. The sulfonation reaction is carried out at 50-60 °c to produce a mixture of 2-naphthylamine -5-sulfonic acid and 2-naphthylamine -8-sulfonic acid, which is diluted with water and then adjusted to pH 9 by adding sodium hydroxide solution, filtration and evaporation gave the sodium salt. Then it is extracted and separated with ethanol, and the extract is evaporated to dryness to obtain 2-naphthylamino-5-sulfonic acid sodium salt, and then hydrolyzed and acidified to obtain the finished product. |
Last Update：2024-04-10 22:29:15
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View History
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