1-Naphthol

Naphthol is a compound shaped with the aid of the substitution of a hydrogen atom on the naphthalene ring through a hydroxyl group. have α- and β- Two isomers of naphthol, additionally referred to as 1-Naphthol and 2-Naphthol. The Molecular system is C10H7OH, and the structural formulation are proven in the figure. They are all white crystals. α- The isomer is needle fashioned crystal, with a melting factor of ninety six ℃ and a relative density of 1.099 (99/4 ℃). It can evaporate collectively with water vapor or bear sublimation. β- The isomer is a rhombic crystal, with a melting factor of 123~124 ℃ and a density of 1.28 g/cm3 (20 ℃). Both are insoluble in water and without difficulty soluble in natural solvents such as ethanol, benzene, and chloroform. Dissolve in sodium hydroxide answer to generate corresponding sodium naphthol salt. Color response happens when encountering ferric chloride aqueous solution, α- The isomer is crimson in color, β- The isomer seems green. Naphthalene can be sulfonated at exclusive temperatures, such as reacting with focused sulfuric acid at round 60 ℃ α- Naphthalenesulfonic acid, ordinarily received by way of response at one hundred sixty ℃ β- Naphthalene sulfonic acid; They are then one by one fused with sodium hydroxide to structure sodium naphthol salt, which is eventually organized via acidification.