Description

4-[5-[3-Carboxy-5-Hydroxy-1-(4-Sulphophenyl)-1H-Pyrazol-4-Yl]Penta-2,4-Dienylidene]-4,5-Dihydro-5-Oxo-1-(4-Sulphophenyl)-1H-Pyrazole-3-Carboxylic Acid is a high-purity, complex organic dye intermediate essential for synthesizing vibrant and stable colorants. Its value lies in its precise molecular structure, which enables the production of brilliant and durable shades, particularly in the yellow to orange spectrum. This compound is a critical raw material for manufacturers in the colorant and specialty chemical industries seeking consistent quality for demanding applications.

Application

• Primary Intermediate for Reactive Dyes: A key building block in the synthesis of high-performance reactive dyes for textile coloring, especially for cotton and other cellulosic fibers.
• Production of Acid Dyes: Used in the manufacture of acid dyes for coloring wool, silk, and nylon, valued for their brightness and colorfastness.
• Specialty Pigment Synthesis: Serves as a precursor in the creation of high-grade organic pigments for inks, coatings, and plastics.
• Food Colorant Research: Investigated as a potential intermediate for developing novel, stable synthetic food colorants.
• Analytical Chemistry Reagent: Utilized as a specialized chromogenic agent or standard in analytical and research laboratories.
• Functional Dye Manufacturing: A component in the production of dyes for specialized applications, including laser dyes and sensitizers.

Basic Information

Item	Details
Product Name	4-[5-[3-Carboxy-5-Hydroxy-1-(4-Sulphophenyl)-1H-Pyrazol-4-Yl]Penta-2,4-Dienylidene]-4,5-Dihydro-5-Oxo-1-(4-Sulphophenyl)-1H-Pyrazole-3-Carboxylic Acid
CAS No.	32425-62-0
Molecular Formula	C25H18N4O11S2
Molecular Weight	614.56 g/mol
Synonyms	Reactive Yellow 145 (Dye precursor); CI 192145; 4,4'-(1,4-Phenylenebis(1H-pyrazole-5,1-diyl))bis(4-oxobut-2-enoic acid) derivative; Tetrasulfonated pyrazolone derivative; Bis(4-sulfophenyl)pyrazolone dye intermediate; 1,1'-(1,4-Phenylene)bis[1H-pyrazole-3,5-dicarboxylic acid] derivative; Yellow pyrazolone intermediate; Acid Yellow 23 related intermediate
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to stringent quality control protocols to ensure batch-to-batch consistency and high purity. Quality is verified through comprehensive analytical methods including HPLC, UV-Vis spectroscopy, and titration. A Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with every shipment to support your quality assurance and regulatory compliance needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Keep away from incompatible materials such as strong oxidizing agents. The container should be kept tightly sealed when not in use to protect from moisture.

Specification

Item	Specification
Appearance	Yellow to orange powder
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (1% in Water)	Clear, yellow solution

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