Description

4-Aminostilbene-2-Sulphonic Acid is a key organic intermediate featuring both an amino group and a sulfonic acid functionality on a stilbene backbone. This compound matters for its role as a versatile building block in the synthesis of complex dyes, optical brighteners, and specialty chemicals. It is primarily needed by manufacturers in the dye and pigment, textile, and fine chemical industries seeking to produce high-value, color-intensive products.

Application

• Dye and Pigment Intermediate: A crucial precursor in the synthesis of azo dyes, fluorescent dyes, and other complex colorants.
• Optical Brightener Production: Used in the manufacture of stilbene-based optical brightening agents (OBAs) for paper, textiles, and detergents.
• Textile Chemical Synthesis: Serves as a building block for chemicals used in textile finishing and functional treatment processes.
• Fine Chemical Synthesis: An important intermediate in organic synthesis for pharmaceuticals, agrochemicals, and other specialty chemicals.
• Research & Development: Utilized in academic and industrial R&D for developing new materials with specific optical or chemical properties.
• Photographic Chemical: Can be employed in the synthesis of certain photographic chemicals and sensitizers.

Basic Information

Product Name	4-Aminostilbene-2-Sulphonic Acid
CAS No.	6265-01-6
Molecular Formula	C14H13NO3S
Molecular Weight	275.32 g/mol
Synonyms	4-Amino-2-styrylbenzenesulfonic Acid; 2-Styrylaniline-5-sulfonic Acid; 4-Amino-trans-stilbene-2-sulfonic Acid; 4-Aminostilbene-2-sulfonic Acid; 2-(4-Aminophenyl)ethenylbenzenesulfonic Acid; trans-4-Aminostilbene-2-sulfonic Acid; 4-Amino-α-styrylbenzenesulfonic Acid
EINECS	228-420-5

Quality Control

Our 4-Aminostilbene-2-Sulphonic Acid is produced under a stringent quality management system. Each batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, identity, and impurity profiles. A comprehensive Certificate of Analysis (COA) detailing results from HPLC, IR, and other relevant tests is provided with every shipment to guarantee traceability and compliance with your quality requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from strong acids and organic solvents. Due to its light-sensitive nature, containers should be opaque or stored in dark conditions to prevent degradation.

Specification

Item	Specification
Appearance	Yellow to brownish powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
Sulfated Ash	≤ 0.5%
Related Substances (HPLC)	Total impurities ≤ 2.0%
Solubility	Soluble in alkaline solutions; sparingly soluble in water

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