Product Overview

1-Amino-2-naphthol-4-sulfonic Acid 90% Extra Pure (CAS No. 116-63-2) is a multifunctional aromatic compound containing amino, phenolic hydroxyl, and sulfonic acid groups on a naphthalene framework. The neighbouring amino and hydroxyl functionalities provide useful redox and derivatisation behaviour, while the sulfonic acid group supports salt formation and incorporation into sulfonated aromatic systems. This combination gives the compound established relevance as a reducing reagent in molybdenum-based colour reactions and as an intermediate in azo-compound chemistry.

The Extra Pure grade is intended for routine laboratory reagent preparation, analytical research, preparative organic chemistry, and dye-intermediate development. It is suitable for colour-forming procedures involving phosphate or silica, diazotisation reactions leading to functional naphthalene derivatives, and the preparation of azo and metal-complex dye intermediates.

Typical Applications

• Reducing reagent in molybdenum-blue colorimetric procedures
• Preparation of aminonaphtholsulfonic acid reagent solutions
• Colorimetric determination of phosphate in suitable analytical procedures
• Enhanced colorimetric measurement of low concentrations of dissolved silica
• Preparation of 1-diazo-2-naphthol-4-sulfonic acid
• Intermediate for azo and acid-dye synthesis
• Preparation of selected metal-complex dye intermediates
• Research involving sulfonated aminonaphthol and naphthalene derivatives

Common Synonyms

• 1-Amino-2-naphthol-4-sulphonic Acid
• 4-Amino-3-hydroxy-1-naphthalenesulfonic Acid
• 4-Amino-3-hydroxynaphthalene-1-sulfonic Acid
• 1-Amino-2-hydroxy-4-naphthalenesulfonic Acid
• 2-Hydroxy-4-sulfo-1-naphthylamine
• 1-Amino-4-sulfo-2-naphthol
• 1,2,4-Aminonaphtholsulfonic Acid
• 1,2,4-Acid
• Aminonaphtholsulfonic Acid

Storage Conditions

Store in a tightly closed container in a cool, dry, and well-ventilated location. Protect the material from direct light, excessive heat, moisture, and contamination. Minimise dust formation during dispensing and reseal the container promptly after use to preserve reagent quality.