Description

4-Nitro-2-Aminobenzenesulfonic Acid is a key aromatic sulfonic acid derivative, serving as a vital intermediate in the synthesis of complex organic molecules. Its value lies in its bifunctional structure, containing both a reactive amino group and a nitro group ortho to a sulfonic acid, making it a versatile building block for dyes and pharmaceuticals. This compound is essential for manufacturers and R&D laboratories in the fine chemical, dye, and pharmaceutical industries seeking high-purity intermediates for advanced synthesis.

Application

• Primary intermediate in the synthesis of azo dyes and pigments, particularly for producing vibrant and stable colors.
• Key building block in pharmaceutical research for creating sulfonamide-based drug candidates and other active pharmaceutical ingredients (APIs).
• Used in the production of optical brighteners and fluorescent whitening agents for paper and detergent industries.
• Employed as a chemical reagent in organic synthesis laboratories for introducing sulfonic acid and nitroaniline functionalities.
• Intermediate for manufacturing specialty chemicals, including corrosion inhibitors and photographic chemicals.
• Starting material for synthesizing liquid crystal compounds and other advanced materials.

Basic Information

Product Name	4-Nitro-2-Aminobenzenesulfonic Acid
CAS No.	24311-40-8
Molecular Formula	C6H6N2O5S
Molecular Weight	218.19 g/mol
Synonyms	2-Amino-4-nitrobenzenesulfonic acid; 4-Nitro-2-aminobenzenesulfonic acid; 2-Amino-4-nitrobenzene-1-sulfonic acid; 4-Nitro-o-anilinesulfonic acid; 1-Amino-2-nitro-4-sulfobenzene; Benzenesulfonic acid, 2-amino-4-nitro-; C.I. 37040; 4-Nitro-2-aminobenzene sulfonic acid
EINECS	Contact for details

Quality Control

Our 4-Nitro-2-Aminobenzenesulfonic Acid is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets exacting specifications for use in sensitive applications like pharmaceutical synthesis. Certificates of Analysis (COA) documenting all critical parameters are available upon request to support your quality assurance protocols.

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); ensure containers are kept tightly sealed to prevent absorption of atmospheric moisture, which can affect quality and handling properties.

Specification

Item	Specification
Appearance	Yellow to brownish crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Residue on Ignition	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

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