Description

4-Aminonaphthalene-2-Sulphonic Acid is a high-purity aromatic sulfonic acid derivative, serving as a critical intermediate in the synthesis of complex organic molecules. Its value lies in its bifunctional structure, featuring both an amino and a sulfonic acid group, which enables its use in creating dyes, pigments, and specialty chemicals. This compound is essential for manufacturers and R&D laboratories in the dyestuff, pharmaceutical, and agrochemical sectors seeking reliable, high-quality building blocks for their synthesis processes.

Application

• Primary Intermediate for Azo Dyes and Pigments: A key starting material in the production of acid dyes, direct dyes, and lake pigments, contributing to color strength and fastness properties.
• Pharmaceutical Intermediate: Used in the synthesis of certain active pharmaceutical ingredients (APIs) and diagnostic agents due to its reactive functional groups.
• Agrochemical Synthesis: Employed as a building block for manufacturing specific herbicides, fungicides, and other crop protection agents.
• Research & Development: A valuable reagent in organic chemistry research for constructing naphthalene-based compounds and studying sulfonation/amination reactions.
• Specialty Chemical Production: Finds use in the manufacture of optical brighteners, corrosion inhibitors, and other performance chemicals.

Basic Information

Product Name	4-Aminonaphthalene-2-Sulphonic Acid
CAS No.	134-54-3
Molecular Formula	C₁₀H₉NO₃S
Molecular Weight	223.25 g/mol
Synonyms	2-Amino-5-naphthalenesulfonic Acid; 4-Amino-2-naphthalenesulfonic Acid; 1-Naphthylamine-6-sulfonic Acid; 6-Amino-1-naphthalenesulfonic Acid; 1,6-Cleve's Acid; 6-Amino-1-naphtholsulfonic Acid; 4-Amino-2-naphthalenesulphonic Acid; 1-Naphthylamine-6-sulphonic Acid
EINECS	205-138-7

Quality Control

Our 4-Aminonaphthalene-2-Sulphonic Acid is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing, including assay, impurity profiling, and identity confirmation, to ensure it meets the high standards required for industrial and research applications. A Certificate of Analysis (COA) detailing purity, physical characteristics, and test results is provided with every shipment to guarantee traceability and consistency.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area away from incompatible materials. Recommended storage temperature is 15-25°C. The product is light-sensitive and should be handled accordingly to maintain stability.

Specification

Item	Specification
Appearance	Off-white to light gray powder or crystals
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
Sulfated Ash	≤ 0.5%
Related Substances (HPLC)	Total impurities ≤ 2.0%
Solubility	Soluble in alkaline solutions

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