Description

2,5-Dichloro-4-[4-[[3-[(Ethylphenylamino)Sulphonyl]-p-Tolyl]Azo]-4,5-Dihydro-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]Benzenesulphonic Acid is a high-purity, synthetic organic compound belonging to the azo pyrazolone chemical class, known for its specific chromophoric properties. This compound is valued for its role as a key intermediate in the synthesis of specialized dyes and pigments, offering precise color characteristics and stability. It is primarily required by manufacturers in the colorant industry for producing high-performance pigments used in inks, coatings, and specialty polymers.

Application

• Primary intermediate in the synthesis of high-performance azo pyrazolone pigments and dyes.
• Key component for producing colorants used in industrial inks for packaging and printing.
• Manufacturing of pigments for coatings and paints requiring specific shade and lightfastness.
• Used in the coloration of specialty polymers and engineering plastics.
• Potential research chemical for developing novel dye-sensitized materials in photochemical applications.
• Intermediate in the fine chemical sector for custom synthesis projects.

Basic Information

Product Name	2,5-Dichloro-4-[4-[[3-[(Ethylphenylamino)Sulphonyl]-p-Tolyl]Azo]-4,5-Dihydro-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]Benzenesulphonic Acid
CAS No.	40537-81-3
Molecular Formula	C31H27Cl2N5O6S2
Molecular Weight	684.60 g/mol
Synonyms	Benzenesulfonic acid, 2,5-dichloro-4-[4-[[3-[(ethylphenylamino)sulfonyl]-4-methylphenyl]azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]-; 40537-81-3; Azo pyrazolone intermediate; 1H-Pyrazole-1-benzenesulfonic acid derivative; Pigment Yellow 191 intermediate; C.I. Pigment Yellow 191 precursor; 4-[4-[[3-[(Ethylphenylamino)sulfonyl]-p-tolyl]azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]-2,5-dichlorobenzenesulfonic acid
EINECS	Contact for details

Quality Control

Our production of this advanced intermediate adheres to stringent quality control protocols to ensure batch-to-batch consistency and high purity. Each lot is analyzed using modern analytical techniques including HPLC and NMR to verify identity and assay. A comprehensive Certificate of Analysis (COA) detailing purity, impurity profile, and physical specifications is provided with every shipment 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 a controlled room temperature (15-25°C). Keep away from incompatible materials. The product is light-sensitive and should be stored away from direct light exposure.

Specification

Item	Specification
Appearance	Yellow to orange powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 1.0%
Related Substances (HPLC)	Total impurities ≤ 5.0%
Heavy Metals	≤ 20 ppm

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