Description

4-Chlorobenzenesulfonic Acid is a versatile aromatic sulfonic acid derivative, serving as a key intermediate in the synthesis of more complex organic molecules. Its primary value lies in its reactive sulfonyl chloride precursor, enabling the introduction of the sulfonyl group into target compounds. This chemical is essential for manufacturers and R&D facilities in the pharmaceutical, agrochemical, and specialty chemical industries seeking to develop active ingredients, dyes, and functional materials.

Application

• Pharmaceutical Intermediate: Crucial for synthesizing active pharmaceutical ingredients (APIs), particularly in the development of sulfonamide-based drugs.
• Agrochemical Synthesis: Used in the production of herbicides, fungicides, and other crop protection agents where the chlorobenzenesulfonyl moiety is required.
• Dye and Pigment Manufacturing: Acts as an intermediate in the creation of sulfonated azo dyes and other colorants.
• Polymer Modification: Employed to introduce sulfonic acid groups into polymers, enhancing properties like hydrophilicity or ion-exchange capacity.
• Chemical Research & Development: A valuable building block in organic synthesis for creating novel compounds in academic and industrial labs.
• Surfactant and Detergent Industry: Can be used in the synthesis of specialized surfactants due to its aromatic sulfonic acid structure.

Basic Information

Product Name	4-Chlorobenzenesulfonic Acid
CAS No.	98-66-8
Molecular Formula	C6H5ClO3S
Molecular Weight	192.62 g/mol
Synonyms	p-Chlorobenzenesulfonic Acid; Benzenesulfonic acid, 4-chloro-; 4-Chlorobenzene-1-sulfonic acid; p-Chlorophenylsulfonic Acid; 4-CBSA; PCBS; 1-Chloro-4-sulfobenzene; Para-Chlorobenzenesulfonic Acid
EINECS	202-690-3

Quality Control

Our 4-Chlorobenzenesulfonic Acid is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure identity, purity, and consistency. We provide a detailed Certificate of Analysis (COA) with each shipment, documenting key parameters such as assay, impurity profile, and physical characteristics. Our quality commitment supports 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 room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed to prevent absorption of atmospheric moisture, which can affect product quality and handling.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Melting Point	Contact for details
Loss on Drying	≤ 1.0%
Heavy Metals	≤ 20 ppm
Residue on Ignition	≤ 0.1%

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