Description

4-Hydrazinobenzenesulfonic Acid Hemihydrate is a specialized aromatic sulfonic acid derivative bearing a reactive hydrazine functional group. This unique bifunctional structure makes it a valuable chemical intermediate and building block for the synthesis of more complex molecules. It is primarily needed by manufacturers in the pharmaceutical and dye and pigment industries, where it serves as a precursor for active pharmaceutical ingredients (APIs) and specialized colorants.

Application

• Pharmaceutical Intermediate: A key precursor in the synthesis of sulfa drugs, heterocyclic compounds, and other active pharmaceutical ingredients (APIs).
• Dye and Pigment Manufacturing: Used as a coupling agent and intermediate in the production of azo dyes and other synthetic colorants.
• Chemical Synthesis: Serves as a versatile building block for creating hydrazone derivatives, sulfonamide compounds, and other fine chemicals.
• Research & Development: Employed in academic and industrial R&D labs for developing new synthetic methodologies and novel compounds.
• Analytical Reagent: Can be utilized in specific analytical chemistry applications for derivatization or as a standard.
• Polymer Chemistry: Potential use as a monomer or modifier in the synthesis of specialty polymers and resins.

Basic Information

Product Name	4-Hydrazinobenzenesulfonic Acid Hemihydrate
CAS No.	854689-07-9
Molecular Formula	C6H8N2O3S • 0.5H2O
Molecular Weight	187.18 g/mol (Anhydrous basis)
Synonyms	4-Hydrazinylbenzenesulfonic Acid Hemihydrate; p-Hydrazinobenzenesulfonic Acid Hemihydrate; Benzenesulfonic acid, 4-hydrazinyl-, hemihydrate; 4-Sulfophenylhydrazine Hemihydrate; 4-Hydrazinobenzene-1-sulfonic Acid Hemihydrate; (4-Hydrazinophenyl)sulfonic Acid Hemihydrate; p-Sulfophenylhydrazine Hemihydrate
EINECS	Contact for details

Quality Control

Our 4-Hydrazinobenzenesulfonic Acid Hemihydrate is produced under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets high-purity standards suitable for pharmaceutical and fine chemical applications. Certificates of Analysis (COA) detailing purity, assay, and impurity profiles 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, well-ventilated area at a controlled room temperature (15-25°C). This product is hygroscopic (moisture-sensitive) and easily oxidized; therefore, it is recommended to store under an inert atmosphere (e.g., nitrogen or argon) after opening to maintain stability and purity. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content (KF)	4.0 - 6.0% (Theoretical for Hemihydrate: ~4.8%)
Related Substances (HPLC)	Total impurities ≤ 2.0%
Residue on Ignition	≤ 0.1%

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