Description

2,5-Dichloro-4-[[4-[[5-[(2,6-Dichloro-4-Pyrimidinyl)Amino]-2-Sulfophenyl]Azo]-4,5-Dihydro-3-Methyl-5-Oxo-1H-Pyrazol]-1-Yl]Benzenesulfonic Acid Disodium Salt is a high-purity, water-soluble azo dye intermediate of significant industrial importance. Its complex molecular structure, featuring dichloropyrimidine and pyrazolone moieties, is engineered to deliver exceptional color strength and stability in demanding applications. This compound is primarily sought by manufacturers in the textile, ink, and specialty chemical sectors for synthesizing high-performance dyes and pigments.

Application

• Textile Dyeing: A key intermediate for the synthesis of reactive and direct dyes, particularly for cotton and cellulose fibers, offering excellent wash and light fastness.
• Ink Manufacturing: Used in the production of high-quality pigments for printing inks, including those for packaging and security applications.
• Specialty Pigments: Serves as a precursor for creating complex, high-value organic pigments used in coatings, plastics, and automotive paints.
• Research & Development: An important building block in chemical R&D for developing novel chromophores and functional dyes with specific optical properties.
• Paper Coloring: Employed in the manufacture of dyes for specialty paper products requiring vibrant and stable coloration.
• Biological Staining: Potential use as an intermediate for synthesizing stains used in histological and cytological applications.

Basic Information

Item	Detail
Product Name	2,5-Dichloro-4-[[4-[[5-[(2,6-Dichloro-4-Pyrimidinyl)Amino]-2-Sulfophenyl]Azo]-4,5-Dihydro-3-Methyl-5-Oxo-1H-Pyrazol]-1-Yl]Benzenesulfonic Acid Disodium Salt
CAS No.	71720-93-9
Molecular Formula	C20H11Cl4N7Na2O7S2
Molecular Weight	729.26 g/mol
Synonyms	Acid Red 337 (C.I. 17210); Reactive Red 120 intermediate; Disodium 2,5-dichloro-4-[4-[5-[(2,6-dichloro-4-pyrimidinyl)amino]-2-sulfophenyl]azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]benzenesulfonate; 2,5-Dichloro-4-{4-[5-[(2,6-dichloro-4-pyrimidinyl)amino]-2-sulfophenyl]hydrazono}-3-methyl-5-oxo-4,5-dihydro-1H-pyrazol-1-yl]benzenesulfonic acid disodium salt; Azo dye intermediate 71720-93-9; C.I. Acid Red 337; Pyrazolone azo dye salt.
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to stringent quality control protocols to ensure batch-to-batch consistency and purity. Every lot is analyzed using advanced techniques like HPLC and spectrophotometry to confirm identity and assay. A comprehensive Certificate of Analysis (COA) detailing purity, impurity profile, and physical specifications is provided with each shipment, ensuring full traceability and compliance with your formulation requirements.

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); keep the container tightly sealed when not in use to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Reddish-brown to dark brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content (KF)	≤ 5.0%
Solubility (1% in Water)	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.