Description

p-[4,5-Dihydro-4-[3-[5-Hydroxy-3-Methyl-1-(4-Sulphophenyl)-1H-Pyrazol-4-Yl]But-2-Enylidene]-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]Benzenesulphonic Acid CAS NO 27981-70-0 is a high-purity, sulfonated pyrazolone derivative with significant industrial utility. This compound is valued for its role as a key synthetic intermediate and functional additive, particularly in the production of specialized dyes, pigments, and optical brighteners. It is essential for manufacturers in the fine chemicals, specialty dyes, and advanced material sectors seeking consistent quality and reliable supply for complex synthesis.

Application

• Synthesis of Acid Dyes and Reactive Dyes: Serves as a critical chromophore intermediate for textile and leather dyes.
• Optical Brightening Agents (OBAs): Used in the manufacture of fluorescent whitening agents for paper, detergents, and plastics.
• Specialty Pigments: A key building block for high-performance pigments used in inks, coatings, and plastics.
• Chemical Intermediate: Employed in organic synthesis for pharmaceuticals and agrochemical research due to its reactive functional groups.
• Analytical Reagents: Can be utilized as a standard or reagent in analytical chemistry and colorimetric assays.
• Functional Additive: Potential use as a light-stabilizing or complexing agent in polymer and material science applications.

Basic Information

Product Name	p-[4,5-Dihydro-4-[3-[5-Hydroxy-3-Methyl-1-(4-Sulphophenyl)-1H-Pyrazol-4-Yl]But-2-Enylidene]-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]Benzenesulphonic Acid
CAS No.	27981-70-0
Molecular Formula	C24H22N4O7S2
Molecular Weight	542.58 g/mol
Synonyms	Benzenesulfonic acid, 4,5-dihydro-4-[3-[5-hydroxy-3-methyl-1-(4-sulfophenyl)-1H-pyrazol-4-yl]-2-butenylidene]-3-methyl-5-oxo-1-(4-sulfophenyl)-1H-pyrazole; 1,1'-(1,4-Butenylene)bis[5-hydroxy-3-methyl-1-(4-sulfophenyl)-1H-pyrazol-4-yl]methane; Acid Yellow 40 intermediate; Pyrazolone derivative, disulfonated; CI 18950 intermediate; 4,4'-(1,4-Butadiene-1,4-diyl)bis[5-hydroxy-3-methyl-1-(4-sulfophenyl)-1H-pyrazole]
EINECS	Contact for details

Quality Control

Our production of p-[4,5-Dihydro-4-[3-[5-Hydroxy-3-Methyl-1-(4-Sulphophenyl)-1H-Pyrazol-4-Yl]But-2-Enylidene]-3-Methyl-5-Oxo-1H-Pyrazol-1-Yl]Benzenesulphonic Acid adheres to stringent quality management protocols. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets exacting industry and customer specifications. Comprehensive Certificates of Analysis (COA) detailing purity, impurity profile, and physical characteristics are provided to guarantee traceability and batch-to-batch consistency.

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. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Yellow to orange-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
Related Substances (HPLC)	Total impurities ≤ 3.0% Any single impurity ≤ 1.0%
Solubility	Soluble in water, alkaline solutions

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