Description

4-Amino-5-Hydroxy-2,7-Naphthalenedisulphonicacid is a high-purity, multi-functional aromatic sulfonic acid derivative, serving as a critical intermediate in advanced organic synthesis. Its unique molecular structure, featuring both amino and hydroxy groups on a naphthalene disulfonic acid backbone, makes it an essential building block for creating complex, high-value compounds. This product is primarily required by manufacturers in the dye, pigment, pharmaceutical, and specialty chemical industries for the development of colorants, optical brighteners, and active pharmaceutical ingredients (APIs).

Application

• Dye and Pigment Intermediate: A key precursor in the synthesis of acid dyes, reactive dyes, and high-performance pigments, particularly for textiles and inks.
• Pharmaceutical Synthesis: Used as a versatile building block in the manufacture of certain APIs and diagnostic agents due to its functional groups.
• Optical Brightener Production: Serves as a core intermediate in the manufacturing of stilbene-based optical brightening agents (OBAs) for paper, detergents, and plastics.
• Chemical Research & Development: Employed in R&D laboratories for developing novel sulfonated compounds and studying reaction mechanisms.
• Specialty Surfactant Synthesis: Can be utilized to create specialized anionic surfactants with unique properties for niche industrial applications.
• Ligand and Chelating Agent: Its structure allows it to act as a ligand for metal ions in certain catalytic or analytical chemistry applications.

Basic Information

Item	Details
Product Name	4-Amino-5-Hydroxy-2,7-Naphthalenedisulphonicacid
CAS No.	50765-94-1
Molecular Formula	C₁₀H₉NO₇S₂
Molecular Weight	319.31 g/mol
Synonyms	2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-; 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid; 5-Amino-4-hydroxynaphthalene-2,7-disulfonic acid; 1-Amino-8-hydroxynaphthalene-3,6-disulfonic acid (alternative numbering); AHNDS; H-Acid analogue; Contact for additional trade names.
EINECS	Contact for details

Quality Control

Our 4-Amino-5-Hydroxy-2,7-Naphthalenedisulphonicacid is produced under a strict quality management system. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets exacting specifications for industrial and fine chemical use. A comprehensive Certificate of Analysis (COA) detailing purity, impurity profile, and physical characteristics 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, and well-ventilated place at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent absorption of atmospheric moisture, which can affect product quality and handling.

Specification

Item	Specification
Appearance	Off-white to light brown powder or crystals
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

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