Description

4-Nitroaniline-3-Sulfonicacid CAS NO 551-91-7 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 nature, providing both a reactive sulfonic acid group and a nitro-substituted aniline moiety for further chemical transformations. This compound is essential for manufacturers in the dye and pigment industry, as well as for research and production of specialty chemicals and pharmaceutical intermediates.

Application

• Primary intermediate for the synthesis of azo dyes and pigments, contributing to color strength and fastness properties.
• Key building block in the production of optical brighteners and fluorescent whitening agents.
• Used in the manufacture of corrosion inhibitors and specialty surfactants for industrial applications.
• Important precursor for pharmaceutical intermediates, particularly in the synthesis of sulfa drugs and other active pharmaceutical ingredients (APIs).
• Employed in agrochemical research for developing novel herbicides and plant growth regulators.
• Utilized as a reagent in analytical chemistry and organic synthesis research laboratories.

Basic Information

Product Name	4-Nitroaniline-3-Sulfonicacid
CAS No.	551-91-7
Molecular Formula	C6H6N2O5S
Molecular Weight	218.19 g/mol
Synonyms	3-Sulfo-4-nitroaniline; 4-Nitro-3-aminobenzenesulfonic Acid; 4-Nitroaniline-3-sulfonic Acid; 2-Amino-5-nitrobenzenesulfonic Acid; 5-Nitro-2-aminobenzenesulfonic Acid; 4-Nitro-m-anilinesulfonic Acid; 1-Amino-2-nitro-5-sulfonic Acid Benzene; NSC 4036
EINECS	209-001-5

Quality Control

Our 4-Nitroaniline-3-Sulfonicacid is produced under a stringent quality management system. Each batch undergoes comprehensive analytical testing to ensure it meets precise chemical and physical specifications. A detailed Certificate of Analysis (COA) is provided with every shipment, documenting purity, identity, and impurity profiles to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive) and light-sensitive; containers must be kept tightly sealed to prevent absorption of atmospheric moisture and degradation.

Specification

Item	Specification
Appearance	Yellow to brown crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 2.0%

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