Description

4-Amino-2-Hydroxybenzenesulfonic Acid is a versatile aromatic sulfonic acid derivative that serves as a critical intermediate in the synthesis of complex organic molecules. Its value lies in its bifunctional structure, featuring both an amino and a phenolic hydroxyl group ortho to the sulfonic acid moiety, enabling its use in coupling reactions and as a building block for dyes and pharmaceuticals. This compound is essential for manufacturers and R&D laboratories in the fine chemical, dye, and pharmaceutical industries seeking high-purity intermediates for advanced synthesis.

Application

• Dye and Pigment Intermediate: A key precursor in the manufacture of azo dyes and other colorants, contributing to chromophore development.
• Pharmaceutical Synthesis: Used as a building block in the production of certain active pharmaceutical ingredients (APIs) and diagnostic agents.
• Chemical Research & Development: Serves as a versatile reagent in organic synthesis for introducing sulfonic acid and aniline functionalities.
• Photographic Chemicals: Can be utilized in the synthesis of certain compounds used in photographic development.
• Corrosion Inhibitor Formulation: Potential use in creating specialty chemicals for metal surface treatment and protection.

Basic Information

Product Name	4-Amino-2-Hydroxybenzenesulfonic Acid
CAS No.	5336-26-5
Molecular Formula	C6H7NO4S
Molecular Weight	189.19 g/mol
Synonyms	2-Hydroxy-4-aminobenzenesulfonic Acid; 4-Amino-2-hydroxybenzenesulphonic Acid; 4-Amino-2-phenol sulfonic acid; 1-Amino-2-hydroxy-5-sulfonic acid benzene; 3-Amino-4-hydroxybenzenesulfonic Acid; Orthanilic Acid, 2-Hydroxy-; 2-Hydroxyaniline-4-sulfonic Acid
EINECS	226-246-1

Quality Control

Our 4-Amino-2-Hydroxybenzenesulfonic Acid is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise specifications. Certificates of Analysis (COA) documenting all critical parameters are provided with every shipment to guarantee traceability and batch-to-batch consistency for your production needs.

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 crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Residue on Ignition (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.