Description

4-Amino-3-Chlorobenzenesulfonic Acid is a key aromatic sulfonic acid derivative, serving as a versatile and high-value intermediate in fine chemical synthesis. Its molecular structure, featuring both amino and chloro substituents on the benzenesulfonic acid core, makes it an essential building block for creating complex molecules with specific functionalities. This compound is particularly critical for manufacturers in the dye, pigment, and pharmaceutical industries who require reliable, high-purity raw materials for their production processes.

Application

• Dye and Pigment Intermediate: A crucial precursor in the synthesis of azo dyes, acid dyes, and reactive dyes, contributing to color fastness and specific hue properties.
• Pharmaceutical Synthesis: Used as a building block in the manufacture of active pharmaceutical ingredients (APIs) and other fine chemicals, leveraging its sulfonic acid group for solubility and its aromatic ring for structural diversity.
• Agrochemical Production: Serves as an intermediate in the synthesis of certain herbicides, fungicides, and plant growth regulators.
• Chemical Research & Development: Employed in organic synthesis laboratories for developing new compounds and conducting structure-activity relationship (SAR) studies.
• Corrosion Inhibitor Formulation: Can be utilized in the development of specialty chemicals designed to protect metal surfaces in industrial applications.
• Photographic Chemical: Finds application in the production of certain chemicals used in photographic development processes.

Basic Information

Product Name	4-Amino-3-Chlorobenzenesulfonic Acid
CAS No.	98-35-1
Molecular Formula	C6H6ClNO3S
Molecular Weight	207.63 g/mol
Synonyms	3-Chloro-4-aminobenzenesulfonic Acid; 2-Chloro-5-sulfoaniline; 5-Amino-2-chlorobenzenesulfonic Acid; 4-Amino-3-chlorobenzene-1-sulfonic Acid; Benzenesulfonic acid, 4-amino-3-chloro-; C.I. 37040; 2-Chloroaniline-5-sulfonic Acid; 5-Sulfo-2-chloroaniline
EINECS	202-658-2

Quality Control

Our 4-Amino-3-Chlorobenzenesulfonic Acid is produced under a stringent quality management system. Each batch undergoes comprehensive analytical testing to ensure it meets exacting purity and consistency standards. A detailed Certificate of Analysis (COA) is provided with every shipment, documenting key parameters such as assay, impurity profile, and physical characteristics. We are committed to supplying material that supports your GMP and ISO-aligned manufacturing requirements.

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). This product is hygroscopic (moisture-sensitive); therefore, the container must be kept tightly sealed after opening to prevent absorption of atmospheric moisture, which can affect quality and handling properties.

Specification

Item	Specification
Appearance	Off-white to light gray crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
Sulfated Ash	≤ 0.5%
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.