Description

p-[4,5-Dihydro-4-[[5-Hydroxy-3-Methyl-1-(4-Sulphophenyl)-1H-Pyrazol-4-Yl]Methylene]-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]Benzenesulphonic Acid is a specialized pyrazolone-based organic intermediate featuring dual sulphonic acid groups, which confer high water solubility and reactivity. This compound is valued for its role as a key precursor in the synthesis of high-performance dyes and pigments, particularly azo dyes, due to its ability to form stable chromophores. It is essential for manufacturers in the textile, ink, and specialty chemical industries seeking to produce vivid, lightfast colors.

Application

• Primary Intermediate for Azo Dyes & Pigments: Serves as a critical coupling component in the production of acid dyes, direct dyes, and reactive dyes for textiles (cotton, wool, nylon).
• Specialty Ink Formulations: Used in the manufacture of inks for jet printing, packaging, and security applications requiring specific color properties and stability.
• Functional Chemical Synthesis: Acts as a building block for creating more complex sulfonated compounds used in dispersants, optical brighteners, or liquid crystal materials.
• Research & Development: Employed in academic and industrial R&D for developing novel chromogenic agents and studying structure-property relationships in dye chemistry.

Basic Information

Product Name	p-[4,5-Dihydro-4-[[5-Hydroxy-3-Methyl-1-(4-Sulphophenyl)-1H-Pyrazol-4-Yl]Methylene]-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]Benzenesulphonic Acid
CAS No.	51596-04-4
Molecular Formula	C21H18N4O8S2
Molecular Weight	518.52 g/mol
Synonyms	4,5-Dihydro-5-oxo-4-[(5-hydroxy-3-methyl-1-(4-sulfophenyl)-1H-pyrazol-4-yl)methylene]-3-methyl-1-(4-sulfophenyl)-1H-pyrazole; 1H-Pyrazole-1-benzenesulfonic acid, 4,5-dihydro-4-[[5-hydroxy-3-methyl-1-(4-sulfophenyl)-1H-pyrazol-4-yl]methylene]-3-methyl-5-oxo-; Benzenesulfonic acid, p-[4,5-dihydro-4-[[5-hydroxy-3-methyl-1-(4-sulfophenyl)-1H-pyrazol-4-yl]methylene]-3-methyl-5-oxo-1H-pyrazol-1-yl]-; Pyrazolone derivative intermediate; Disulfonated pyrazolone dye intermediate.
EINECS	Contact for details

Quality Control

Our production of this advanced intermediate adheres to strict quality management protocols to ensure batch-to-batch consistency and high purity. Each lot is analyzed using modern analytical techniques including HPLC, UV-Vis, and NMR to verify identity and composition. A Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with every shipment to support your quality assurance and regulatory 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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product stability and performance.

Specification

Item	Specification
Appearance	Yellow to orange-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 3.0%
Solubility (Water)	Freely soluble

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