Description

4-Chloronaphthalene-1-Sulfonic Acid is a versatile aromatic sulfonic acid derivative that serves as a critical intermediate in advanced organic synthesis. Its value lies in the combination of a reactive sulfonic acid group and a chlorinated naphthalene backbone, enabling precise functionalization for creating complex molecules. This compound is essential for manufacturers and R&D teams in the pharmaceutical, agrochemical, and specialty dye industries seeking to develop new active ingredients and high-performance materials.

Application

• Pharmaceutical Intermediate: Key building block in the synthesis of active pharmaceutical ingredients (APIs), particularly for compounds with naphthalene-based structures.
• Agrochemical Synthesis: Used in the production of herbicides, fungicides, and other crop protection agents where its chlorosulfonate group aids in creating bioactive molecules.
• Dye and Pigment Manufacturing: Acts as a precursor for synthesizing sulfonated azo dyes and pigments, enhancing water solubility and color fastness.
• Chemical Research & Development: Valuable reagent for academic and industrial research in organic chemistry, catalysis, and material science.
• Surfactant and Detergent Industry: Potential intermediate for producing specialized anionic surfactants due to its sulfonic acid functionality.
• Polymer Modification: Used to introduce sulfonate groups into polymers, altering their solubility, ionic character, and material properties.

Basic Information

Product Name	4-Chloronaphthalene-1-Sulfonic Acid
CAS No.	6328-72-9
Molecular Formula	C10H7ClO3S
Molecular Weight	242.68 g/mol
Synonyms	1-Naphthalenesulfonic acid, 4-chloro-; 4-Chloro-1-naphthalenesulfonic acid; 4-Chloronaphthalene-1-sulphonic acid; 4-Chloro-1-naphthalenesulphonic acid; 4-Chloro-1-naphthylsulfonic acid; NSC 403107; 4-Chloronaphthalenesulfonic Acid
EINECS	228-696-2

Quality Control

Our 4-Chloronaphthalene-1-Sulfonic Acid is produced under a strict quality management system. Each batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise customer specifications and consistent batch-to-batch reliability. Certificates of Analysis (COA) documenting all critical parameters are provided and available upon request.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture. Keep away from strong bases and incompatible materials.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
Heavy Metals (as Pb)	≤ 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.