Description

5-Amino-4-Hydroxynaphthalene-2-Sulphonic Acid is a key naphthalene-based intermediate with significant utility in advanced organic synthesis. This compound matters for its role as a versatile building block in the production of high-value, complex molecules, particularly dyes and pigments. Industries involved in the manufacture of specialty chemicals, including colorants for textiles, inks, and functional materials, require this high-purity intermediate for consistent and reliable synthesis.

Application

• Primary intermediate in the synthesis of azo dyes and pigments for textiles, leather, and inks.
• Key precursor for manufacturing specialty colorants used in high-performance applications.
• Building block in organic synthesis for pharmaceutical intermediates and research chemicals.
• Used in the development of functional dyes for optical and electronic applications.
• Intermediate for analytical reagents and chemical sensors.
• Starting material for research in coordination chemistry and metal-complex dyes.

Basic Information

Product Name	5-Amino-4-Hydroxynaphthalene-2-Sulphonic Acid
CAS No.	35400-55-6
Molecular Formula	C₁₀H₉NO₄S
Molecular Weight	239.25 g/mol
Synonyms	5-Amino-4-hydroxy-2-naphthalenesulfonic acid; 4-Hydroxy-5-amino-2-naphthalenesulfonic acid; 1-Amino-2-hydroxy-6-naphthalenesulfonic acid; 6-Amino-7-hydroxy-3-naphthalenesulfonic acid; 5-Amino-4-naphthol-2-sulfonic acid; 4-Hydroxy-5-aminonaphthalene-2-sulfonic acid; 1,6-Cleve's Acid (isomer); Contact for additional trade names.
EINECS	Contact for details

Quality Control

Our 5-Amino-4-Hydroxynaphthalene-2-Sulphonic Acid is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, identity, and consistency. Certificates of Analysis (COA) documenting key parameters such as assay, impurity profile, and physical characteristics are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Off-white to light brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%
Related Substances (HPLC)	Total impurities ≤ 2.0%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.