Description

1-(3-Sulfophenyl)-3-Methyl-5-Pyrazolone CAS NO 119-17-5 is a versatile organic intermediate characterized by its sulfonated pyrazolone structure. This compound is valued for its role as a key building block in the synthesis of high-performance dyes, pigments, and functional chemicals. It is primarily sought after by manufacturers in the colorant, pharmaceutical, and specialty chemical industries for producing azo dyes, photographic chemicals, and analytical reagents.

Application

• Azo Dye & Pigment Synthesis: A crucial coupling component for manufacturing yellow, orange, and red azo dyes and organic pigments used in textiles, inks, and plastics.
• Photographic Industry: Used in the production of color couplers and other light-sensitive chemicals for photographic films and papers.
• Pharmaceutical Intermediates: Serves as a precursor in the synthesis of certain active pharmaceutical ingredients (APIs) and diagnostic agents.
• Analytical Reagents: Employed as a chelating agent and reagent in analytical chemistry for metal ion detection and complexometric titrations.
• Specialty Chemical Production: A building block for creating surfactants, corrosion inhibitors, and other functional additives.

Basic Information

Item	Detail
Product Name	1-(3-Sulfophenyl)-3-Methyl-5-Pyrazolone
CAS No.	119-17-5
Molecular Formula	C10H10N2O4S
Molecular Weight	254.26 g/mol
Synonyms	3-Methyl-1-(3-sulfophenyl)-2-pyrazolin-5-one; 5-Pyrazolone, 1-(3-sulfophenyl)-3-methyl-; 1-(3-Sulfophenyl)-3-methyl-5-pyrazolone; 3-Methyl-1-(3-sulfophenyl)-5-pyrazolone; 1-(m-Sulfophenyl)-3-methyl-5-pyrazolone; Pyrazolone S; Metanil Yellow Intermediate; Acid Yellow 36 Intermediate
EINECS	204-306-9

Quality Control

Our 1-(3-Sulfophenyl)-3-Methyl-5-Pyrazolone is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise specifications for critical applications like dye synthesis. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee traceability and compliance.

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 absorption of atmospheric moisture, which can affect product quality and handling.

Specification

Item	Specification
Appearance	Yellow to light brown 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.