Description

4-Nitrobenzenesulfonic Acid is a versatile and important aromatic sulfonic acid derivative, widely utilized as a key synthetic intermediate in organic chemistry. Its value lies in the reactive nitro and sulfonic acid functional groups, which allow for selective transformations in multi-step synthesis. This compound is essential for manufacturers and R&D laboratories in the pharmaceutical, agrochemical, and dye industries, where it serves as a crucial building block for more complex molecules.

Application

• Pharmaceutical Intermediate: A key precursor in the synthesis of various active pharmaceutical ingredients (APIs), particularly sulfonamide-based drugs.
• Agrochemical Synthesis: Used in the production of herbicides, pesticides, and plant growth regulators.
• Dye and Pigment Manufacturing: Serves as an intermediate for azo dyes and other colorants.
• Chemical Research & Development: Employed in academic and industrial labs for developing new synthetic methodologies and novel compounds.
• Polymer Modification: Can be used to introduce sulfonic acid groups into polymers, altering their solubility and ionic properties.
• Catalyst and Ligand Preparation: Useful for synthesizing specialized catalysts and ligands used in organic transformations.

Basic Information

Product Name	4-Nitrobenzenesulfonic Acid
CAS No.	138-42-1
Molecular Formula	C6H5NO5S
Molecular Weight	203.17 g/mol
Synonyms	p-Nitrobenzenesulfonic Acid; Benzenesulfonic acid, 4-nitro-; Nitrobenzenesulfonic Acid; 4-Nitrobenzene-1-sulfonic acid; p-Nitrobenzene sulfonic acid; 4-NBSA; NSC 403697
EINECS	205-326-9

Quality Control

Our 4-Nitrobenzenesulfonic Acid is produced under a strict quality management system. Each batch undergoes comprehensive analytical testing, including assay, impurity profiling, and identification, to ensure it meets the high standards required for industrial and research applications. Certificates of Analysis (COA) detailing purity, physical characteristics, and test results are provided with every shipment and are available upon request.

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 product is hygroscopic (moisture-sensitive) and a strong acid; ensure containers are kept tightly sealed to prevent absorption of atmospheric moisture and corrosion. Keep away from incompatible materials such as strong bases and reducing agents.

Specification

Item	Specification
Appearance	Off-white to pale yellow crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Residue on Ignition	≤ 0.1%
Heavy Metals (as Pb)	≤ 20 ppm

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