Description

4-Hydrazinobenzenesulfonic Acid is a versatile aromatic sulfonic acid derivative containing a reactive hydrazine functional group. This compound is a critical synthetic intermediate and coupling agent in the production of high-value specialty chemicals. It is essential for manufacturers in the pharmaceutical, dye and pigment, and agrochemical industries seeking to develop novel compounds and colorants.

Application

• Pharmaceutical Intermediate: Key building block in the synthesis of active pharmaceutical ingredients (APIs), particularly for drugs containing azo or hydrazone linkages.
• Dye and Pigment Manufacturing: Acts as a crucial diazo component and coupling agent in the production of azo dyes, pigments, and colorants for textiles, inks, and plastics.
• Agrochemical Synthesis: Used in the development of herbicides, fungicides, and plant growth regulators that require the sulfonic acid hydrazide moiety.
• Chemical Research & Development: Serves as a versatile reagent for organic synthesis, enabling the introduction of sulfonic acid and hydrazine functionalities.
• Photographic Chemicals: Employed in the formulation of certain developers and other specialty chemicals for photographic processes.
• Corrosion Inhibitor Precursor: Used in the synthesis of compounds that protect metals in industrial cooling and process water systems.

Basic Information

Product Name	4-Hydrazinobenzenesulfonic Acid
CAS No.	98-71-5
Molecular Formula	C6H8N2O3S
Molecular Weight	188.20 g/mol
Synonyms	4-Sulfophenylhydrazine; p-Hydrazinobenzenesulfonic Acid; Benzenesulfonic acid, 4-hydrazinyl-; (4-Hydrazinophenyl)sulfonic Acid; Hydrazinobenzene-4-sulfonic Acid; 4-Hydrazinylbenzenesulfonic Acid; p-Sulfophenylhydrazine
EINECS	202-696-1

Quality Control

Our 4-Hydrazinobenzenesulfonic 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 the high standards required for sensitive synthetic applications. Certificates of Analysis (COA) detailing all specifications 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 a controlled room temperature (15-25°C). Due to its light-sensitive and easily oxidized nature, it is recommended to store under an inert atmosphere (e.g., nitrogen or argon) for long-term stability. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	White to light yellow crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
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.