Description

4-[(4-Amino-2-Sulphophenyl)Azo]-4,5-Dihydro-5-Oxo-1-(4-Sulphophenyl)-1H-Pyrazole-3-Carboxylic Acid is a high-purity, water-soluble azo pyrazole carboxylic acid derivative, serving as a critical intermediate in the synthesis of specialized dyes and pigments. Its precise molecular structure is engineered to provide excellent color fastness and thermal stability in demanding applications. This compound is essential for manufacturers in the textile, ink, and specialty chemical industries seeking to produce vibrant, durable colors.

Application

• Primary Intermediate for Reactive Dyes: Key building block in the synthesis of high-performance reactive dyes for cotton and other cellulosic fibers.
• Specialty Pigment Manufacturing: Used in the production of organic pigments for inks, coatings, and plastics requiring specific hue and stability.
• Textile Colorants: Imparts bright, wash-fast colors in textile dyeing and printing processes.
• Research & Development: Serves as a precursor in academic and industrial R&D for novel chromophores and functional dyes.
• Analytical Chemistry: Can be utilized as a standard or reagent in colorimetric analysis and detection methods.

Basic Information

Item	Detail
Product Name	4-[(4-Amino-2-Sulphophenyl)Azo]-4,5-Dihydro-5-Oxo-1-(4-Sulphophenyl)-1H-Pyrazole-3-Carboxylic Acid
CAS No.	5656-10-0
Molecular Formula	C16H13N5O8S2
Molecular Weight	467.43 g/mol
Synonyms	Acid Red 337; C.I. 17200; 1H-Pyrazole-3-carboxylic acid, 4,5-dihydro-5-oxo-4-[(2-sulfo-4-aminophenyl)azo]-1-(4-sulfophenyl)-; 4-[(4-Amino-2-sulfophenyl)azo]-4,5-dihydro-5-oxo-1-(4-sulfophenyl)-1H-pyrazole-3-carboxylic acid; Reactive Red Dye Intermediate; Azo Pyrazole Carboxylic Acid Derivative
EINECS	Contact for details

Quality Control

Every batch of our 4-[(4-Amino-2-Sulphophenyl)Azo]-4,5-Dihydro-5-Oxo-1-(4-Sulphophenyl)-1H-Pyrazole-3-Carboxylic Acid is manufactured under a strict quality management system. We ensure compliance with relevant industry standards through rigorous in-process and final testing, including HPLC for purity and identity confirmation. A comprehensive Certificate of Analysis (COA) detailing purity, impurity profile, and physical characteristics is provided with each shipment to guarantee traceability and consistency for your production needs.

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 nature, the container must be kept tightly sealed after opening to minimize moisture absorption. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Reddish-brown to dark brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Water Solubility	Freely soluble

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