Description

3-Methyl-1-(4-Sulfophenyl)-2-Pyrazolin-5-One CAS NO 89-36-1 is a high-purity, sulfonated pyrazolone derivative, a key intermediate in the synthesis of azo dyes and pigments. This compound is valued for its ability to impart bright, stable colors and its role in creating water-soluble dye structures. It is essential for manufacturers in the dyestuff, textile, and specialty chemical industries seeking reliable intermediates for high-performance colorants.

Application

• Primary Intermediate for Azo Dyes & Pigments: Serves as a crucial coupling component in the production of acid dyes, direct dyes, and reactive dyes for textiles, leather, and paper.
• Specialty Colorant Synthesis: Used in the manufacture of high-value, water-soluble dyes with enhanced brightness and wash-fastness properties.
• Chemical Research & Development: Acts as a building block in organic synthesis for novel chromophores and functional materials.
• Analytical Reagent: Employed in certain colorimetric detection methods and as a standard in chromatographic analysis.

Basic Information

Product Name	3-Methyl-1-(4-Sulfophenyl)-2-Pyrazolin-5-One
CAS No.	89-36-1
Molecular Formula	C10H10N2O4S
Molecular Weight	254.26 g/mol
Synonyms	1-(4-Sulfophenyl)-3-methyl-5-pyrazolone; 4-Sulfophenyl-3-methyl-5-pyrazolone; 3-Methyl-1-p-sulfophenyl-2-pyrazolin-5-one; 5-Pyrazolone-3-methyl-1-(4-sulfophenyl); 89-36-1; 1-(4-Sulfophenyl)-3-methyl-5-pyrazolone; 3-Methyl-1-(4-sulfophenyl)-5-pyrazolone; Pyrazolone S
EINECS	201-902-6

Quality Control

Our 3-Methyl-1-(4-Sulfophenyl)-2-Pyrazolin-5-One is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets exacting industry specifications. A detailed Certificate of Analysis (COA) is provided with each shipment to guarantee traceability and consistent quality.

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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent moisture absorption and potential degradation.

Specification

Item	Specification
Appearance	White to light yellow crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

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