Description

4-Aminobenzenesulfinic Acid Sodium Salt (Trihydrate) is a key organic intermediate and reducing agent with significant commercial importance. Its primary value lies in its ability to act as a sulfinate source and a mild reducing agent in complex organic syntheses, particularly for the pharmaceutical industry. This compound is essential for manufacturers in fine chemical, pharmaceutical, and dye production who require high-purity building blocks for advanced synthesis.

Application

• Pharmaceutical Intermediate: A crucial building block in the synthesis of sulfonamide drugs, specialty APIs, and other active pharmaceutical ingredients.
• Dye and Pigment Manufacturing: Used in the production of azo dyes and other colorants where its sulfinic acid group is integral to the chromophore structure.
• Organic Synthesis Reagent: Functions as a versatile reducing agent and a source of the sulfinate anion in nucleophilic substitution and radical reactions.
• Photographic Chemical: Employed in certain photographic developing agents and as a stabilizer in silver halide emulsions.
• Polymer Industry: Can be used as a monomer or modifying agent in the synthesis of specialty polymers and resins.
• Research & Development: Serves as a valuable reagent in academic and industrial R&D labs for exploring new synthetic methodologies.

Basic Information

Product Name	4-Aminobenzenesulfinic Acid Sodium Salt (Trihydrate)
CAS No.	15898-44-9
Molecular Formula	C6H8NNaO2S · 3H2O
Molecular Weight	233.20 g/mol (Anhydrous basis: 175.15 g/mol)
Synonyms	Sodium 4-Aminobenzenesulfinate Trihydrate; Sodium p-Aminobenzenesulfinate Trihydrate; Sulfanilic Acid Sodium Salt (Sulfinate Form); Benzenesulfinic acid, 4-amino-, sodium salt, trihydrate; p-Sulfanilic Acid Sodium Salt; Sodium Sulfanilate (Sulfinate); Aniline-4-sulfinic Acid Sodium Salt
EINECS	Contact for details

Quality Control

Our 4-Aminobenzenesulfinic Acid Sodium Salt (Trihydrate) is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing to ensure it meets precise specifications for identity, purity, and impurity profiles. A comprehensive Certificate of Analysis (COA) detailing results from HPLC, titration, and other relevant tests is provided with every shipment to guarantee traceability and batch-to-batch consistency for your critical processes.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed after opening to prevent moisture absorption, which can affect product stability and performance.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (Titration)	≥ 98.0% (on anhydrous basis)
Water Content (KF)	20.0% - 25.0% (Theoretical for Trihydrate: ~23.2%)
Related Substances (HPLC)	Total impurities ≤ 2.0%
Solubility	Soluble in water

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