Description

2-[[1-(2-Chloro-6-Methyl-4-Sulfophenyl)-4,5-Dihydro-3-Methyl-5-Oxo-1H-Pyrazol-4-Yl]Azo]-1-Naphthalenesulfonic Acid Disodium Salt is a high-purity, water-soluble azo dye intermediate of significant commercial importance. Its core value lies in its role as a key precursor for synthesizing vibrant and stable dyes and pigments, particularly in the red to violet color spectrum. This compound is essential for manufacturers in the textile, ink, and specialty coatings industries seeking to produce high-performance colorants.

Application

• Primary intermediate for the synthesis of acid dyes and reactive dyes used in textile coloring, especially for wool, silk, and nylon.
• Key building block in the production of pigments for inks, including those for packaging, publication, and specialty printing applications.
• Used in the manufacture of colorants for leather and other specialty coatings.
• Potential intermediate for research and development of novel dyes and functional materials in chemical R&D laboratories.
• Employed in the synthesis of dyes for paper coloration and other industrial applications requiring specific color properties.

Basic Information

Product Name	2-[[1-(2-Chloro-6-Methyl-4-Sulfophenyl)-4,5-Dihydro-3-Methyl-5-Oxo-1H-Pyrazol-4-Yl]Azo]-1-Naphthalenesulfonic Acid Disodium Salt
CAS No.	6359-56-4
Molecular Formula	C21H16ClN4Na2O7S2
Molecular Weight	604.93 g/mol
Synonyms	Acid Red 337; C.I. 17210; 2-[(1-(2-Chloro-6-methyl-4-sulfophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl)azo]-1-naphthalenesulfonic acid disodium salt; 1-Naphthalenesulfonic acid, 2-[[1-(2-chloro-6-methyl-4-sulfophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl]azo]-, disodium salt; Disodium 2-[(1-(2-chloro-6-methyl-4-sulphophenyl)-4,5-dihydro-3-methyl-5-oxopyrazol-4-yl)azo]naphthalene-1-sulphonate; C.I. Acid Red 337; Dye intermediate 6359-56-4
EINECS	228-791-9

Quality Control

Our production of 2-[[1-(2-Chloro-6-Methyl-4-Sulfophenyl)-4,5-Dihydro-3-Methyl-5-Oxo-1H-Pyrazol-4-Yl]Azo]-1-Naphthalenesulfonic Acid Disodium Salt adheres to stringent quality management protocols to ensure batch-to-batch consistency and purity suitable for industrial synthesis. All material is accompanied by a comprehensive Certificate of Analysis (COA) detailing key parameters such as assay, impurity profile, and physical specifications. We support our clients' compliance needs with full traceability and documentation.

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). 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 handling properties.

Specification

Item	Specification
Appearance	Reddish-brown to dark brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm
Residue on Ignition (Sulfated Ash)	Conforms

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