Description

3-Chloro-4-Methylbenzenesulfonic Acid is a versatile aromatic sulfonic acid derivative, serving as a key synthetic intermediate and functional additive. Its value lies in its strong acidic character and the reactivity of its sulfonyl chloride precursor, enabling precise chemical modifications. This compound is essential for manufacturers in the agrochemical, pharmaceutical, and specialty chemical sectors seeking to build complex molecular architectures.

Application

• Agrochemical Intermediate: A crucial building block for the synthesis of advanced herbicides, fungicides, and plant growth regulators.
• Pharmaceutical Synthesis: Used in the production of active pharmaceutical ingredients (APIs) and diagnostic agents, particularly where a chlorinated benzenesulfonate moiety is required.
• Dye & Pigment Manufacturing: Acts as an intermediate in the synthesis of azo dyes and other complex colorants, providing sulfonation sites.
• Polymer & Resin Modification: Employed as a curing agent, catalyst, or functional monomer to impart specific properties like hydrophilicity or ionic character to polymers.
• Electroplating Additives: Used in plating bath formulations to improve brightness, leveling, and throwing power of metal deposits.
• Research & Development: A valuable reagent in organic synthesis laboratories for introducing sulfonic acid groups into target molecules.

Basic Information

Product Name	3-Chloro-4-Methylbenzenesulfonic Acid
CAS No.	98-34-0
Molecular Formula	C7H7ClO3S
Molecular Weight	206.65 g/mol
Synonyms	4-Chloro-m-toluenesulfonic Acid; 2-Chloro-4-methylbenzenesulfonic Acid; 3-Chloro-p-toluenesulfonic Acid; 4-Methyl-3-chlorobenzenesulfonic Acid; 3-Chloro-4-methylbenzenesulphonic Acid; NSC 403754; Benzenesulfonic acid, 3-chloro-4-methyl-
EINECS	202-660-6

Quality Control

Our production of 3-Chloro-4-Methylbenzenesulfonic Acid adheres to stringent quality management protocols. Every batch is analyzed using advanced techniques like HPLC and titration to ensure high purity and consistency. A comprehensive Certificate of Analysis (COA) detailing identity, assay, and impurity profiles is provided with each shipment to support your quality assurance and regulatory compliance 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 nature, keep the container tightly sealed when not in use to prevent moisture absorption. Keep away from strong bases and oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 1.0%
Melting Point	Contact for details
Heavy Metals (as Pb)	≤ 20 ppm

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