Description

4-(4-Amino-5-Methoxy-2-Methylphenylazo)-5-Phenylsulfonyloxy-2,7-Naphthalenedisulfonic Acid Disodium Salt is a high-purity, water-soluble anionic dye intermediate of significant commercial importance. Its complex molecular structure, featuring azo, sulfonic acid, and phenylsulfonyloxy groups, makes it a critical precursor for synthesizing specialized dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty chemical industries seeking to produce vibrant, color-fast products with specific functional properties.

Application

• Primary Intermediate for Reactive Dyes: A key building block in the synthesis of high-performance reactive dyes for cotton and other cellulosic fibers.
• Specialty Pigment Manufacturing: Used in the production of complex organic pigments for inks, coatings, and plastics requiring high color strength and stability.
• Functional Dye Synthesis: Serves as a precursor for dyes used in specialized applications, including laser marking, optical data storage, and non-impact printing.
• Textile Colorants: Imparts specific shades with good wash and light fastness properties in finished textile products.
• Research & Development: Utilized in chemical R&D for developing novel chromophores and studying structure-property relationships in dye chemistry.
• Analytical Chemistry: Can be employed as a staining agent or a complexometric indicator in certain analytical methodologies.

Basic Information

Product Name	4-(4-Amino-5-Methoxy-2-Methylphenylazo)-5-Phenylsulfonyloxy-2,7-Naphthalenedisulfonic Acid Disodium Salt
CAS No.	77847-22-4
Molecular Formula	C24H19N3Na2O11S3
Molecular Weight	699.57 g/mol
Synonyms	Acid Red 337 (related dye class); Disodium 4-[(4-amino-5-methoxy-2-methylphenyl)azo]-5-(phenylsulfonyloxy)-2,7-naphthalenedisulfonate; 2,7-Naphthalenedisulfonic acid, 4-[(4-amino-5-methoxy-2-methylphenyl)azo]-5-(phenylsulfonyloxy)-, disodium salt; C.I. 17200; Azo dye intermediate 77847-22-4; 5-(Phenylsulfonyloxy)-4-[(4-amino-5-methoxy-2-methylphenyl)azo]-2,7-naphthalenedisulfonic acid disodium salt
EINECS	Contact for details

Quality Control

Every batch of our 4-(4-Amino-5-Methoxy-2-Methylphenylazo)-5-Phenylsulfonyloxy-2,7-Naphthalenedisulfonic Acid Disodium Salt is manufactured under a strict quality management system. We employ advanced analytical techniques including HPLC, UV-Vis, and NMR to ensure chemical identity, purity, and batch-to-batch consistency. A comprehensive Certificate of Analysis (COA) detailing purity, impurity profile, and physical specifications 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 area at a controlled room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product quality and handling properties.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content (KF)	≤ 5.0%
Solubility (1% in Water)	Complete, clear solution
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 3.0%

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