Description

7-Amino-4-hydroxy-2-naphthalenesulfonic acid is a key naphthalene-based intermediate with a sulfonic acid group, offering versatile reactivity for synthesis. This compound is valued for its role as a crucial building block in the production of high-value dyes, pigments, and optical brighteners. It is primarily needed by manufacturers in the specialty chemicals, textile dye, and advanced materials sectors for creating colorants and functional molecules.

Application

• Dye and Pigment Intermediate: A primary precursor in the synthesis of azo dyes, acid dyes, and reactive dyes for textiles and leather.
• Optical Brightener Production: Used in the manufacture of stilbene-based optical brightening agents (OBAs) for paper, detergents, and plastics.
• Chemical Synthesis: Serves as a versatile building block for creating more complex naphthalene derivatives in pharmaceutical and agrochemical research.
• Functional Material Development: Investigated for use in the development of organic semiconductors, sensors, and light-harvesting materials.
• Laboratory Reagent: Employed as a standard or reagent in analytical chemistry and research laboratories.

Basic Information

Product Name	7-Amino-4-hydroxy-2-naphthalenesulfonic acid
CAS No.	139123-66-3
Molecular Formula	C₁₀H₉NO₄S
Molecular Weight	239.25 g/mol
Synonyms	7-Amino-4-hydroxy-2-naphthalenesulfonic acid; 2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-; 4-Hydroxy-7-amino-2-naphthalenesulfonic acid; 7-Amino-4-hydroxynaphthalene-2-sulfonic acid; 1-Amino-8-hydroxy-3,6-naphthalenedisulfonic acid (isomer reference); J acid isomer; Aryl amino hydroxysulfonic acid intermediate; Contact for additional trade names.
EINECS	Contact for details

Quality Control

Our 7-Amino-4-hydroxy-2-naphthalenesulfonic acid is produced under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets precise chemical and physical specifications. A Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with every shipment to guarantee consistency and support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at 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.

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%
Related Substances (HPLC)	Individual impurity ≤ 1.0%; Total impurities ≤ 3.0%

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