Description

1-[3-[[(4-Amino-9,10-dihydro-9,10-dioxo-3-sulfoanthracen)-1-yl]amino]-5-sulfophenyl]-4,5-dihydro-5-oxo-4-[[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-1H-pyrazole-3-carboxylic acid 3-methyl ester is a high-purity, reactive dye intermediate belonging to the anthraquinone and pyrazole chemical classes. This compound is engineered to deliver exceptional color strength and fastness properties in demanding dyeing applications. It is a critical raw material for manufacturers in the textile and specialty chemical industries seeking to produce high-performance dyes and pigments.

Application

This advanced dye intermediate is designed for high-value applications where color performance and chemical stability are paramount.

• Primary use in the synthesis of reactive dyes for cotton, viscose, and other cellulosic fibers.
• Manufacturing of high-grade pigments and colorants for industrial coatings and inks.
• Production of specialized dyes for leather and paper coloring.
• As a key intermediate in research and development of novel chromophores and functional dyes.
• Potential use in the formulation of dye-sensitized solar cells (DSSCs) and other optoelectronic materials.

Basic Information

Product Name	1-[3-[[(4-Amino-9,10-dihydro-9,10-dioxo-3-sulfoanthracen)-1-yl]amino]-5-sulfophenyl]-4,5-dihydro-5-oxo-4-[[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-1H-pyrazole-3-carboxylic acid 3-methyl ester
CAS No.	73157-49-0
Molecular Formula	C35H26N6O16S3
Molecular Weight	906.81 g/mol
Synonyms	Reactive Black 5 Intermediate; Anthraquinone Pyrazole Dye Intermediate; 1H-Pyrazole-3-carboxylic acid, 1-[3-[[(4-amino-9,10-dihydro-9,10-dioxo-3-sulfo-1-anthracenyl)amino]-5-sulfophenyl]-4,5-dihydro-5-oxo-4-[[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-, methyl ester; C.I. Reactive Black 5 precursor; Sulfonated anthraquinone-azo-pyrazole ester; CAS 73157-49-0
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to strict quality management systems to ensure batch-to-batch consistency and purity. Every lot is analyzed using advanced techniques including HPLC, IR spectroscopy, and elemental analysis to verify identity and potency. A comprehensive Certificate of Analysis (COA) detailing purity, impurity profile, and physical specifications 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). Keep away from heat, sparks, and open flame. Due to its light-sensitive nature, the container should be opaque or stored in darkness.

Specification

Item	Specification
Appearance	Dark powder or crystalline solid
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 95.0%
Water Content	≤ 5.0%
Sulfated Ash	≤ 2.0%
Heavy Metals (as Pb)	≤ 20 ppm

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