Description

2-[5-[[2-(Acetoxy)Ethyl]Sulphonyl]-2-Methoxyphenyl]-2,4-Dihydro-5-Methyl-4-[(4-Methyl-2-Nitrophenyl)Azo]-3H-Pyrazol-3-One is a specialized azo pyrazolone derivative, valued for its role as a key chromophore and intermediate in the synthesis of high-performance colorants. Its complex molecular structure provides excellent color fastness and thermal stability, making it a critical component for demanding applications. This compound is primarily sought by manufacturers in the dyes and pigments industry, as well as by research institutions developing advanced functional materials.

Application

• Primary intermediate for the synthesis of high-grade azo disperse dyes and pigments.
• Key chromophore component in colorants for synthetic fibers such as polyester and acetate.
• Used in research and development of functional dyes for specialized optical or electronic applications.
• Potential intermediate for colorants in inks and coatings requiring specific hue and stability.
• Reference standard for analytical and quality control laboratories in the chemical industry.

Basic Information

Product Name	2-[5-[[2-(Acetoxy)Ethyl]Sulphonyl]-2-Methoxyphenyl]-2,4-Dihydro-5-Methyl-4-[(4-Methyl-2-Nitrophenyl)Azo]-3H-Pyrazol-3-One
CAS No.	85750-10-3
Molecular Formula	C28H27N5O8S
Molecular Weight	593.61 g/mol
Synonyms	Disperse Red 277; C.I. 111397; 2-[5-[[2-(Acetyloxy)ethyl]sulfonyl]-2-methoxyphenyl]-2,4-dihydro-5-methyl-4-[(4-methyl-2-nitrophenyl)azo]-3H-pyrazol-3-one; 4-[(4-Methyl-2-nitrophenyl)azo]-5-methyl-2-[5-[(2-acetoxyethyl)sulfonyl]-2-methoxyphenyl]-2,4-dihydro-3H-pyrazol-3-one; Acetate ester of a sulfonated azo pyrazolone dye intermediate
EINECS	Contact for details

Quality Control

Our production of this advanced intermediate adheres to stringent quality control protocols to ensure batch-to-batch consistency and purity. Each lot is analyzed using modern analytical techniques including HPLC and spectroscopy to verify identity and assay. A comprehensive Certificate of Analysis (COA) detailing purity, impurity profile, and physical characteristics is provided with every shipment to support your quality assurance processes.

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 light-sensitive and easily oxidized nature, it is recommended to store the material under an inert atmosphere for long-term preservation and to minimize exposure to air and moisture upon opening.

Specification

Item	Specification
Appearance	Reddish-brown to dark brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Residue on Ignition	≤ 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.