Description

1H-Pyrazole-3-carboxylic acid,4-[3-[3-(ethoxycarbonyl)-1,5-dihydro-5-oxo-1-(4-sulfophenyl)-4H-pyrazol-4-ylidene]-1-propenyl]-4,5-dihydro-5-oxo-1-(4-sulfophenyl)-,3-ethyl ester,dipotassium salt is a high-purity, water-soluble organic salt belonging to the pyrazolone dye intermediate class. This compound is valued for its role as a key chromophore and functional building block in the synthesis of specialized dyes and pigments. It is primarily required by manufacturers in the colorants, specialty chemicals, and advanced materials sectors seeking consistent quality for high-performance applications.

Application

• Primary Intermediate for Reactive Dyes: A critical precursor in the synthesis of high-value reactive dyes for textile fibers like cotton and nylon.
• Functional Dye Manufacturing: Used in producing specialized dyes for applications in ink-jet printing, digital textile printing, and color filters.
• Pigment Synthesis: Serves as a key component in the manufacture of high-performance organic pigments with excellent color strength and fastness properties.
• Research & Development: Employed in academic and industrial R&D for developing novel chromophores and functional materials with specific optical properties.
• Analytical Chemistry: Can be utilized as a standard or reagent in analytical methods for dye and pigment analysis.

Basic Information

Product Name	1H-Pyrazole-3-carboxylic acid,4-[3-[3-(ethoxycarbonyl)-1,5-dihydro-5-oxo-1-(4-sulfophenyl)-4H-pyrazol-4-ylidene]-1-propenyl]-4,5-dihydro-5-oxo-1-(4-sulfophenyl)-,3-ethyl ester,dipotassium salt
CAS No.	94421-83-7
Molecular Formula	C27H22K2N4O12S2
Molecular Weight	736.82 g/mol
Synonyms	Reactive Yellow 145 (Dipotassium Salt); C.I. Reactive Yellow 145; 4,4'-(1E)-1,3-Propanediyldiene-1,5-dihydro-5-oxo-1-(4-sulfophenyl)-4H-pyrazol-4-ylidene]bis[4,5-dihydro-5-oxo-1-(4-sulfophenyl)-1H-pyrazole-3-carboxylic acid] diethyl ester, dipotassium salt; 1H-Pyrazole-3-carboxylic acid, 4,4'-(1,3-propanediyldiene)bis[4,5-dihydro-5-oxo-1-(4-sulfophenyl)-, diethyl ester, dipotassium salt; PYRAZOLONE YELLOW INTERMEDIATE; Dipotassium 4,4'-[(1E)-1,3-propanediyldiene-1,5-dihydro-5-oxo-1-(4-sulfophenyl)-4H-pyrazol-4-ylidene]bis[4,5-dihydro-5-oxo-1-(4-sulfophenyl)-1H-pyrazole-3-carboxylate]
EINECS	Contact for details

Quality Control

Our production of this pyrazolone intermediate adheres to strict quality control protocols to ensure batch-to-batch consistency and high purity for sensitive synthesis processes. Each lot is analyzed using advanced techniques including HPLC and spectrophotometry. A comprehensive Certificate of Analysis (COA) detailing identity, purity, 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 after opening to prevent absorption of atmospheric moisture, which can affect product stability and performance.

Specification

Item	Specification
Appearance	Yellow to orange-yellow powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content (KF)	≤ 5.0%
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Clear, complete solution

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