Description

4-Chloro-3-Nitrobenzenesulfonic Acid is a versatile aromatic sulfonic acid derivative, serving as a critical building block in advanced organic synthesis. Its value lies in its bifunctional reactivity, featuring both a sulfonic acid group and a nitro-chloro substituted benzene ring, enabling precise chemical modifications. This compound is essential for manufacturers and R&D laboratories in the pharmaceutical, agrochemical, and specialty dye industries seeking to develop novel active ingredients and functional materials.

Application

• Pharmaceutical Intermediate: Key precursor in the synthesis of active pharmaceutical ingredients (APIs), particularly for sulfonamide-based drugs.
• Agrochemical Synthesis: Used in manufacturing herbicides, fungicides, and plant growth regulators where the benzenesulfonic acid moiety is required.
• Dye and Pigment Manufacturing: Acts as an intermediate for producing azo dyes and other complex colorants.
• Chemical Research & Development: Valuable building block for creating novel sulfonated compounds in academic and industrial R&D settings.
• Polymer Modification: Can be used to introduce sulfonic acid groups into polymers to alter solubility or ionic characteristics.
• Corrosion Inhibitor Formulation: Serves as a component in specialty chemical blends designed to prevent metal corrosion.

Basic Information

Product Name	4-Chloro-3-Nitrobenzenesulfonic Acid
CAS No.	121-18-6
Molecular Formula	C6H4ClNO5S
Molecular Weight	237.62 g/mol
Synonyms	3-Nitro-4-chlorobenzenesulfonic Acid; 4-Chloro-3-nitrobenzenesulphonic Acid; 1-Chloro-2-nitro-4-sulfobenzene; Benzenesulfonic acid, 4-chloro-3-nitro-; NSC 4035; 4-Chloro-3-nitrobenzene-1-sulfonic acid; 4-Chloro-3-nitro-phenylsulfonic acid
EINECS	204-454-7

Quality Control

Our 4-Chloro-3-Nitrobenzenesulfonic Acid is produced under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets precise specifications for identity, purity, and impurity profiles. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing all relevant parameters. Our quality commitment supports compliance with cGMP and ISO standards where required for your application.

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). Keep away from strong bases, strong oxidizing agents, and moisture. For long-term storage, consider under an inert atmosphere to maintain optimal purity.

Specification

Item	Specification
Appearance	Off-white to pale yellow crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
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.