Alpha Naphthol

Alpha Naphthol

CAS Number:90‑15‑3

Synonyms:α‑Naphthol; 1‑Hydroxynaphthalene; 1‑Naphthol

Chemical Formula:C₁₀H₈O

Product Introduction

Alpha Naphthol is a white to off-white crystalline aromatic compound with a phenolic hydroxyl group. It's widely used as an intermediate in dye, insecticide, pharmaceutical, and analytical reagent industries.

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Physical & Chemical Properties

Property Value
Appearance White to tan crystalline powder
Purity ≥ 99.5 % (1‑naphthol), ≤ 0.1 % (2‑naphthol impurity)
Melting Point 94–96 °C (lit.)
Boiling Point 278–280 °C (lit.)
Density ~1.10–1.22 g/cm³
Molecular Weight 144.17 g/mol
Water Solubility 436.7 mg/L @ 25 °C
Refractive Index ~1.6224

Applications

  • Dye/intermediate synthesis: Key precursor for acid dyes (e.g., Acid Yellow 1), diagnostics, and insecticides like carbaryl.
  • Analytical reagent: Used in Molisch’s carbohydrate test and Sakaguchi reaction.
  • Fine chemicals:Precursor in rubber antioxidants, perfumes, pharmaceuticals, and surface chemistry.

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