Description

4-(2,3-Dihydro-3-Oxobenzo[B]Thiophen-2-Ylidene)Methyl-1,3-Benzenedisulfonic Acid Disodium Salt is a high-purity, water-soluble organic salt characterized by its distinct chromophoric structure, making it a valuable intermediate for advanced chemical synthesis. Its primary commercial value lies in its role as a key precursor for the production of functional dyes, optical brighteners, and specialized pigments. This compound is essential for manufacturers and R&D laboratories in the fine chemicals, specialty dyes, and advanced materials sectors seeking consistent quality and reliable supply for their formulations.

Application

• Key Intermediate for Functional Dyes: Serves as a critical building block in the synthesis of reactive and acid dyes for textiles and leather.
• Optical Brightener Production: Used in the manufacture of stilbene-based optical brightening agents (OBAs) for paper, detergents, and plastics.
• Specialty Pigment Synthesis: Acts as a precursor for high-performance organic pigments used in inks, coatings, and plastics.
• Research & Development: Employed in academic and industrial R&D for developing new chromophores and fluorescent markers.
• Photographic Chemicals: Can be utilized in the synthesis of certain dye components for color photographic processes.
• Liquid Crystal Display (LCD) Materials: Potential intermediate for dyes used in display technologies.

Basic Information

Product Name	4-(2,3-Dihydro-3-Oxobenzo[B]Thiophen-2-Ylidene)Methyl-1,3-Benzenedisulfonic Acid Disodium Salt
CAS No.	79285-09-9
Molecular Formula	C16H10Na2O7S3
Molecular Weight	464.38 g/mol
Synonyms	Benzenesulfonic acid, 4-[(2,3-dihydro-3-oxo-2-benzothienylidene)methyl]-, disodium salt; 2-(4-Sulfo-2-sulfomethylbenzylidene)benzo[b]thiophen-3(2H)-one disodium salt; Stilbene derivative intermediate; Optical brightener intermediate VBL type; 4,4'-Bis[(4-anilino-6-morpholino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid related intermediate; DAS 1 intermediate; Sodium 4-[(3-oxo-2,3-dihydro-1-benzothiophen-2-ylidene)methyl]benzene-1,3-disulfonate
EINECS	Contact for details

Quality Control

Our production of 4-(2,3-Dihydro-3-Oxobenzo[B]Thiophen-2-Ylidene)Methyl-1,3-Benzenedisulfonic Acid Disodium Salt adheres to stringent quality management protocols to ensure batch-to-batch consistency and high purity. The material is manufactured in facilities that follow cGMP (current Good Manufacturing Practice) guidelines where applicable. Every batch is accompanied by a comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles, available upon request. We support compliance with global regulatory frameworks including REACH.

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). This product is hygroscopic (moisture-sensitive); the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect quality and handling properties. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Yellow to orange-yellow powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 2.0%
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Clear, yellow solution

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