Description

1-(3-Aminophenyl)-4,5-dihydro-4-[[4-[[3-methyl-4-[[3-methyl-4-[[4,8-bis(sodiosulfo)-2-naphthalenyl]azo]phenyl]azo]phenyl]aminocarbonyl]phenyl]azo]-5-oxo-1H-pyrazole-3-carboxylic acid sodium salt is a high-purity, water-soluble azo dye intermediate of significant commercial importance. Its complex, multi-functional structure is engineered to provide excellent chromophoric properties and strong binding affinity for various substrates. This compound is essential for manufacturers requiring precise color development and enhanced fastness properties in advanced dye and pigment synthesis. It serves as a critical building block for the production of specialized dyes used in textiles, inks, and other industrial colorant applications.

Application

• Primary Intermediate for Reactive Dyes: A key precursor 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 that demand high color strength and stability.
• Textile Dyeing and Printing: Imparts vibrant and durable colors with good wash and light fastness in textile applications.
• Functional Dye Synthesis: Serves as a starting material for dyes with specialized functions, such as those used in biological staining or sensitizers.
• Research & Development: Utilized in chemical R&D for developing novel chromophores and studying azo dye chemistry and properties.

Basic Information

Item	Detail
Product Name	1-(3-Aminophenyl)-4,5-dihydro-4-[[4-[[3-methyl-4-[[3-methyl-4-[[4,8-bis(sodiosulfo)-2-naphthalenyl]azo]phenyl]azo]phenyl]aminocarbonyl]phenyl]azo]-5-oxo-1H-pyrazole-3-carboxylic acid sodium salt
CAS No.	6428-24-6
Molecular Formula	C45H30N10Na3O11S2
Molecular Weight	1030.87 g/mol
Synonyms	Acid Red 337; C.I. 17200; Sodium 1-(3-aminophenyl)-4,5-dihydro-4-[[4-[[3-methyl-4-[[3-methyl-4-[[4,8-disulfo-2-naphthyl]azo]phenyl]azo]phenyl]carbamoyl]phenyl]azo]-5-oxo-1H-pyrazole-3-carboxylate; 1H-Pyrazole-3-carboxylic acid, 1-(3-aminophenyl)-4,5-dihydro-4-[[4-[[[3-methyl-4-[[3-methyl-4-[[4,8-disulfo-2-naphthalenyl]azo]phenyl]azo]phenyl]amino]carbonyl]phenyl]azo]-5-oxo-, trisodium salt; Trisodium 1-(3-aminophenyl)-4,5-dihydro-4-[[4-[[3-methyl-4-[[3-methyl-4-[(4,8-disulfo-2-naphthyl)azo]phenyl]azo]phenyl]carbamoyl]phenyl]azo]-5-oxo-1H-pyrazole-3-carboxylate
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to strict quality management systems to ensure batch-to-batch consistency and purity. Every lot undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation and spectrophotometric analysis for color value. We provide full traceability and Certificates of Analysis (COA) are available upon request, detailing all critical specifications 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 room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent degradation from atmospheric moisture.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture (KF)	≤ 5.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm
Sulfated Ash	Contact for details

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