1,7-Dihydroxynaphthalene CAS#575-38-2
1,7‑Dihydroxynaphthalene, also known as 1,7‑naphthalenediol, is an important naphthalene‑based fine organic intermediate. It generally appears as pale yellow to light brown crystalline powder. It dissolves readily in ethanol, ether and other common organic solvents, while sparingly soluble in cold water. It is prone to color change when exposed to light, so light‑proof sealed storage is required.
It is widely adopted as a key raw material for synthesizing azo dyes, reactive dyes and other dyestuff products. It is also used in the preparation of hair dye intermediates, pharmaceutical intermediates and organic analytical reagents. Its unique molecular structure enables it to deliver stable color‑developing performance in dye synthesis.
1,7-Dihydroxynaphthalene Chemical Properties
| Melting point | 180-184 °C (lit.) |
| Boiling point | 246.06°C (rough estimate) |
| density | 1.0924 (rough estimate) |
| refractive index | 1.5418 (estimate) |
| Fp | 252 °C |
| storage temp. | Sealed in dry,Room Temperature |
| solubility | DMSO (Slightly), Methanol (Slightly) |
| pka | 9.58±0.40(Predicted) |
| form | Solid |
| color | Beige to Dark Brown |
| Water Solubility | Slightly soluble in water. |
| λmax | 335nm(Cyclohexane)(lit.) |
| BRN | 1908499 |
| CAS DataBase Reference | 575-38-2(CAS DataBase Reference) |
| NIST Chemistry Reference | 1,7-Dihydroxynaphthalene(575-38-2) |
| EPA Substance Registry System | Napthalene-1,7-diol (575-38-2) |
