Description

5-Amino-2-Hydroxybenzenesulphonic Acid is a versatile aromatic sulfonic acid derivative that serves as a critical intermediate in the synthesis of complex organic molecules. Its bifunctional nature, featuring both an amino and a hydroxy group ortho to the sulfonic acid, makes it a valuable building block for creating dyes, pigments, and pharmaceutical compounds. This high-purity intermediate is essential for manufacturers in the fine chemical, specialty dye, and agrochemical industries seeking reliable and consistent raw material quality for their synthesis processes.

Application

• Dye and Pigment Intermediate: A key precursor in the manufacture of azo dyes, acid dyes, and reactive dyes, contributing to color fastness and molecular stability.
• Pharmaceutical Synthesis: Used as a building block for active pharmaceutical ingredients (APIs) and diagnostic agents, leveraging its sulfonic acid group for solubility and bioavailability.
• Agrochemical Production: Employed in the synthesis of certain herbicides and plant growth regulators, where its aromatic structure provides a core scaffold for biological activity.
• Chemical Research & Development: Serves as a versatile reagent in organic synthesis for academic and industrial R&D, particularly in heterocyclic chemistry.
• Complexing Agent: Can function as a ligand or intermediate in the production of metal complex dyes and certain catalysts.

Basic Information

Product Name	5-Amino-2-Hydroxybenzenesulphonic Acid
CAS No.	2835-04-3
Molecular Formula	C6H7NO4S
Molecular Weight	189.19 g/mol
Synonyms	3-Amino-6-hydroxybenzenesulfonic acid; 5-Amino-2-hydroxybenzenesulfonic acid; 2-Hydroxy-5-aminobenzenesulfonic acid; 6-Amino-3-hydroxybenzenesulfonic acid; 1-Amino-2-hydroxy-5-sulfobenzene; 4-Amino-3-hydroxybenzenesulfonic acid (alternate numbering); 5-Amino-2-hydroxybenzene-1-sulfonic acid
EINECS	220-603-6

Quality Control

Our 5-Amino-2-Hydroxybenzenesulphonic Acid is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets exacting specifications for use in sensitive applications. Certificates of Analysis (COA) documenting all critical parameters are provided and available upon request to support your quality assurance and regulatory needs.

Storage

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

Specification

Item	Specification
Appearance	Off-white to light brown crystalline powder
Identification (IR)	Conforms to structure
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.