Description

3,3'-Dimethyl-Naphthidine-Disulfonic Acid is a specialized organic intermediate featuring a naphthidine core substituted with methyl and sulfonic acid groups. This compound matters as a key building block in the synthesis of high-value dyes, pigments, and analytical reagents, where its specific structure imparts critical functional properties. It is primarily needed by manufacturers in the fine chemical, dye and pigment, and research sectors for developing colorants and chemical sensors.

Application

• Key intermediate in the synthesis of azo dyes and pigments for textiles, inks, and plastics.
• Precursor for manufacturing specialized colorants with enhanced lightfastness and thermal stability.
• Used in the development of electrochemical and colorimetric sensors for analytical chemistry applications.
• Building block for functional polymers and advanced materials requiring sulfonated aromatic units.
• Research and development of novel pharmaceutical intermediates and bioactive molecules.
• Component in formulations for specialty coatings and imaging materials.

Basic Information

Product Name	3,3'-Dimethyl-Naphthidine-Disulfonic Acid
CAS No.	55802-03-4
Molecular Formula	C22H18N2O6S2
Molecular Weight	470.52 g/mol
Synonyms	3,3'-Dimethylbenzidine-6,6'-disulfonic Acid; 3,3'-Dimethyl-[1,1'-binaphthalene]-4,4'-diamine-6,6'-disulfonic Acid; o-Tolidine-6,6'-disulfonic Acid; 6,6'-Disulfo-3,3'-dimethylbenzidine; 4,4'-Diamino-3,3'-dimethyl-1,1'-binaphthyl-6,6'-disulfonic Acid; 3,3'-Dimethyl-1,1'-binaphthyl-4,4'-diamine-6,6'-disulfonic Acid; DMNDS Acid
EINECS	Contact for details

Quality Control

Our 3,3'-Dimethyl-Naphthidine-Disulfonic Acid is produced under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure consistent purity and performance for your synthesis needs. A comprehensive Certificate of Analysis (COA) detailing identity, purity, and impurity profiles is provided with each shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed to minimize exposure to atmospheric moisture.

Specification

Item	Specification
Appearance	Off-white to light yellow powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

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