Description

Sodium 2,5-Dichloro-4-[4,5-Dihydro-4-[(4-Hydroxyphenyl)Azo]-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]Benzenesulphonate is a high-purity, water-soluble azo dye intermediate of significant commercial importance. This compound is valued for its role as a key precursor in the synthesis of vibrant and stable reactive and direct dyes. It is primarily needed by manufacturers in the textile, leather, and specialty chemical industries seeking to produce high-performance colorants with excellent fastness properties.

Application

• Primary Intermediate for Reactive Dyes: A crucial building block in the synthesis of reactive dyes for cotton, viscose, and other cellulosic fibers.
• Direct Dye Production: Used in the manufacture of direct dyes for paper, leather, and textile applications requiring good substantivity.
• Specialty Pigments and Colorants: Serves as a precursor for creating specialized pigments used in inks, coatings, and plastics.
• Research & Development: Employed in chemical R&D for developing novel chromophores and studying azo dye chemistry and properties.
• Textile Printing: Utilized in formulations for textile printing pastes to achieve specific, durable shades.

Basic Information

Product Name	Sodium 2,5-Dichloro-4-[4,5-Dihydro-4-[(4-Hydroxyphenyl)Azo]-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]Benzenesulphonate
CAS No.	67875-29-0
Molecular Formula	C16H11Cl2N4O5SNa
Molecular Weight	489.25 g/mol
Synonyms	2,5-Dichloro-4-((4,5-dihydro-3-methyl-5-oxo-4-((4-hydroxyphenyl)azo)-1H-pyrazol-1-yl))benzenesulfonic acid sodium salt; Benzenesulfonic acid, 2,5-dichloro-4-[4,5-dihydro-4-[(4-hydroxyphenyl)azo]-3-methyl-5-oxo-1H-pyrazol-1-yl]-, sodium salt; Sodium 2,5-dichloro-4-(4,5-dihydro-4-((4-hydroxyphenyl)azo)-3-methyl-5-oxo-1H-pyrazol-1-yl)benzenesulfonate; Azo dye intermediate 67875-29-0; Reactive dye intermediate; 1H-Pyrazole-1-benzenesulfonic acid, 4-[4,5-dihydro-4-[(4-hydroxyphenyl)azo]-3-methyl-5-oxo-, sodium salt, 2,5-dichloro-; C.I. Reactive Orange 78 intermediate (related)
EINECS	Contact for details

Quality Control

Our Sodium 2,5-Dichloro-4-[4,5-Dihydro-4-[(4-Hydroxyphenyl)Azo]-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]Benzenesulphonate is produced under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure consistent purity, composition, and performance suitable for industrial dye synthesis. Certificates of Analysis (COA) detailing key specifications are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from incompatible materials. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided.

Specification

Item	Specification
Appearance	Orange to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content	≤ 5.0%
Solubility (in Water)	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm

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