Description

4-Hydroxy-5-[[(p-Tolyl)Sulphonyl]Amino]Naphthalene-2,7-Disulphonic Acid is a specialized naphthalene-based intermediate featuring a tosylamino group and multiple sulphonic acid functionalities. This compound matters for its role as a key building block in the synthesis of complex dyes, pigments, and optical brighteners, where its specific structure imparts valuable properties to the final product. It is primarily needed by manufacturers in the fine chemical, specialty dye, and advanced material sectors seeking high-purity intermediates for research and production.

Application

• Dye and Pigment Intermediate: A crucial precursor in the synthesis of acid dyes, reactive dyes, and high-performance pigments, particularly for textiles and leather.
• Optical Brightener Synthesis: Serves as a key starting material for manufacturing fluorescent whitening agents (FWAs) used in paper, detergents, and plastics.
• Chemical Research & Development: Used in organic synthesis laboratories for developing novel sulfonated aromatic compounds with specific functional properties.
• Specialty Chemical Manufacturing: Employed in the production of other sulfonic acid derivatives for applications in dispersants, surfactants, and complexing agents.

Basic Information

Product Name	4-Hydroxy-5-[[(p-Tolyl)Sulphonyl]Amino]Naphthalene-2,7-Disulphonic Acid
CAS No.	6860-97-5
Molecular Formula	C₁₇H₁₅NO₈S₃
Molecular Weight	473.50 g/mol
Synonyms	5-[(4-Methylphenyl)sulfonyl]amino]-4-hydroxynaphthalene-2,7-disulfonic acid; 4-Hydroxy-5-(p-toluenesulfonamido)naphthalene-2,7-disulfonic acid; 4-Hydroxy-5-(tosylamino)naphthalene-2,7-disulfonic acid; N-(4-Hydroxy-2,7-disulfo-1-naphthyl)-p-toluenesulfonamide; 6860-97-5; Acid Yellow 76 intermediate; C.I. 18850 intermediate
EINECS	Contact for details

Quality Control

Our production of 4-Hydroxy-5-[[(p-Tolyl)Sulphonyl]Amino]Naphthalene-2,7-Disulphonic Acid adheres to stringent quality management protocols. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure consistency and compliance with customer specifications. Certificates of Analysis (COA) documenting all critical parameters are available upon request to support your quality assurance and regulatory needs.

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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed to prevent absorption of atmospheric moisture, which can affect product quality and handling properties.

Specification

Item	Specification
Appearance	Light yellow to beige powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm

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