Description

Disodium p-[4,5-Dihydro-4-[[2-Methoxy-5-[[2-(Sulphonatooxy)Ethyl]Sulphonyl]Phenyl]Azo]-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]Benzenesulphonate is a high-purity, water-soluble anionic dye intermediate characterized by its complex sulfonated azo-pyrazolone structure. This compound is engineered to deliver exceptional color strength, solubility, and stability in demanding aqueous formulations. It is a critical precursor for manufacturers in the textile, ink, and specialty chemical industries who require reliable and consistent performance in the synthesis of reactive and acid dyes.

Application

• Primary Intermediate for Reactive Dyes: Key building block in the synthesis of high-quality reactive dyes for cotton, viscose, and other cellulosic fibers.
• Acid Dye Manufacturing: Used in the production of acid dyes for coloring wool, silk, and nylon.
• Inkjet Ink Formulations: Provides vibrant and stable colorants for industrial and commercial inkjet printing applications.
• Specialty Chemical Synthesis: Serves as a functional intermediate in the creation of other sulfonated aromatic compounds for various industrial processes.
• Research & Development: Used in laboratories for developing new chromophores and studying dye properties.

Basic Information

Item	Detail
Product Name	Disodium p-[4,5-Dihydro-4-[[2-Methoxy-5-[[2-(Sulphonatooxy)Ethyl]Sulphonyl]Phenyl]Azo]-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]Benzenesulphonate
CAS No.	31237-03-3
Molecular Formula	C25H23N4Na2O13S3
Molecular Weight	744.66 g/mol
Synonyms	Disodium 5-[[4-[[2-Methoxy-5-[(2-sulfooxyethyl)sulfonyl]phenyl]azo]-3-methyl-5-oxo-4,5-dihydro-1H-pyrazol-1-yl]benzenesulfonate; Reactive Dye Intermediate; Azo Pyrazolone Sulfonate; C.I. Reactive Orange 16 Intermediate; Benzenesulfonic acid, 5-[[4-[[2-methoxy-5-[(2-sulfooxyethyl)sulfonyl]phenyl]azo]-3-methyl-5-oxo-4,5-dihydro-1H-pyrazol-1-yl]-, disodium salt; 31237-03-3; 4,5-Dihydro-4-[[2-methoxy-5-[[2-(sulphonatooxy)ethyl]sulphonyl]phenyl]azo]-3-methyl-5-oxo-1H-pyrazol-1-yl]benzenesulphonate disodium salt
EINECS	Contact for details

Quality Control

Our production of Disodium p-[4,5-Dihydro-4-[[2-Methoxy-5-[[2-(Sulphonatooxy)Ethyl]Sulphonyl]Phenyl]Azo]-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]Benzenesulphonate adheres to a stringent quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure consistent composition and performance for your synthesis processes. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and impurity profiles 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 room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); ensure the container is kept tightly sealed to prevent absorption of atmospheric moisture, which may affect product stability and handling properties.

Specification

Item	Specification
Appearance	Orange to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content (KF)	≤ 5.0%
pH (1% Solution)	6.0 - 8.0
Solubility in Water	Freely soluble

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