Description

5-Chloro-2-Hydroxy-Benzenesulphonic Acid is a versatile aromatic sulfonic acid derivative that serves as a key synthetic intermediate in advanced organic chemistry. Its value lies in its bifunctional structure, featuring both a phenolic hydroxyl group and a strongly acidic sulfonic acid group, enabling a wide range of chemical transformations. This compound is essential for manufacturers in the pharmaceutical, agrochemical, and specialty dye industries who require a reliable, high-purity building block for complex synthesis.

Application

• Pharmaceutical Intermediate: A crucial precursor in the synthesis of active pharmaceutical ingredients (APIs), particularly for compounds requiring a substituted benzenesulfonic acid moiety.
• Agrochemical Synthesis: Used in the manufacturing of herbicides, fungicides, and other crop protection agents where its chlorophenol structure is incorporated.
• Dye and Pigment Manufacturing: Acts as an intermediate for producing azo dyes and other complex colorants, leveraging its ability to form diazonium salts.
• Chemical Research & Development: Serves as a model compound and starting material in organic synthesis labs for developing new methodologies and molecules.
• Ligand and Chelating Agent Precursor: Utilized in the preparation of specialized ligands for catalysis or metal ion complexation due to its hydroxyl and sulfonate functional groups.
• Polymer Modification: Can be employed to introduce sulfonic acid groups into polymers, modifying properties like hydrophilicity or ion-exchange capacity.

Basic Information

Product Name	5-Chloro-2-Hydroxy-Benzenesulphonic Acid
CAS No.	2051-65-2
Molecular Formula	C6H5ClO4S
Molecular Weight	208.62 g/mol
Synonyms	5-Chloro-2-hydroxybenzenesulfonic acid; 5-Chlorosalicylic acid sulfonic acid; 2-Hydroxy-5-chlorobenzenesulfonic acid; 5-Chloro-2-phenolsulfonic acid; 5-Chlorosalicylic acid-2-sulfonic acid; Benzenesulfonic acid, 5-chloro-2-hydroxy-; 5-Chlorosalicylic acid-2-sulphonic acid
EINECS	218-144-7

Quality Control

Our 5-Chloro-2-Hydroxy-Benzenesulphonic Acid is produced under a stringent quality management system to ensure batch-to-batch consistency and reliability for your critical processes. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing key parameters such as purity, identity, and impurity profiles. Our quality commitment aligns with cGMP principles where applicable, and we support compliance with global regulatory frameworks including REACH.

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. Keep away from incompatible materials such as strong bases and oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Residue on Ignition	≤ 0.1%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Individual impurity ≤ 0.5%; Total impurities ≤ 1.5%

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