Description

4-[[4,5-dihydro-3-methyl-1-(4-methylphenyl)-5-oxo-1H-pyrazol-4-yl]azo]-4'-[[1-[[(2,4-dimethylphenyl)amino]carbonyl]-2-oxopropyl]azo][1,1'-biphenyl]-2,2'-disulphonic acid is a high-purity, complex azo dye intermediate essential for synthesizing specialized colorants. This compound matters for its role in producing vivid, stable pigments and dyes with specific performance characteristics. Industrial manufacturers in the textile, ink, and specialty coatings sectors require this precise chemical building block to develop advanced coloring solutions.

Application

• Primary Intermediate for High-Performance Pigments: A key precursor in the synthesis of complex organic pigments for automotive and industrial coatings.
• Textile Dye Manufacturing: Used in the production of specialized azo dyes for synthetic fibers like polyester and nylon, offering excellent color fastness.
• Inkjet and Digital Printing Inks: Serves as a crucial component for creating high-density colorants in advanced digital printing applications.
• Plastics and Polymer Coloring: Employed in the manufacture of colorants for mass pigmentation of engineering plastics and resins.
• Research & Development: Utilized in chemical R&D for developing novel chromophores and studying structure-color relationships.
• Specialty Coatings: Applied in formulating dyes for specialty coatings requiring specific lightfastness and chemical resistance properties.

Basic Information

Item	Details
Product Name	4-[[4,5-dihydro-3-methyl-1-(4-methylphenyl)-5-oxo-1H-pyrazol-4-yl]azo]-4'-[[1-[[(2,4-dimethylphenyl)amino]carbonyl]-2-oxopropyl]azo][1,1'-biphenyl]-2,2'-disulphonic acid
CAS No.	79665-31-9
Molecular Formula	C37H33N7O8S2
Molecular Weight	767.83 g/mol
Synonyms	Pigment Yellow 191; C.I. 12995; 4,4'-[[1-[[(2,4-Dimethylphenyl)amino]carbonyl]-2-oxopropyl]azo]bis[2,2'-disulfo[1,1'-biphenyl]-4-azo(1)]-3-methyl-1-(4-methylphenyl)-5-pyrazolone; 4,4'-Bis[4-azo-3-methyl-1-(4-methylphenyl)-5-pyrazolone]-2,2'-disulfobiphenyl-4,4'-dicarboxylic acid bis(2,4-dimethylanilide); Azo dye intermediate 79665-31-9; Disazo pyrazolone derivative; [1,1'-Biphenyl]-2,2'-disulfonic acid, 4,4'-[1-[[(2,4-dimethylphenyl)amino]carbonyl]-2-oxopropyl]azo]bis[4-azo-4,5-dihydro-3-methyl-1-(4-methylphenyl)-5-oxo-1H-pyrazole]
EINECS	Contact for details

Quality Control

Our 4-[[4,5-dihydro-3-methyl-1-(4-methylphenyl)-5-oxo-1H-pyrazol-4-yl]azo]-4'-[[1-[[(2,4-dimethylphenyl)amino]carbonyl]-2-oxopropyl]azo][1,1'-biphenyl]-2,2'-disulphonic acid is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise customer specifications and industry standards. Certificates of Analysis (COA) documenting all critical parameters are provided with each shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product quality and performance.

Specification

Item	Specification
Appearance	Yellow to Orange Powder
Identification (IR)	Conforms to Standard
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 3.0% Any single impurity ≤ 1.0%

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