Description

1-Amino-9,10-Dihydro-9,10-Dioxo-4-p-Toluenesulphonamidoanthracene-2-Sulphonic Acid is a specialized anthraquinone derivative and a key intermediate in the synthesis of high-value dyes and pigments. Its molecular structure, featuring both sulphonic acid and sulphonamido groups, is engineered to provide excellent solubility and chromophoric properties. This compound is essential for manufacturers in the colorant industry seeking to produce vivid, stable, and application-specific dyes for textiles, inks, and advanced materials.

Application

• Primary Intermediate for Dye Synthesis: A crucial building block in the production of acid dyes, reactive dyes, and disperse dyes, particularly for polyamide and wool fibers.
• Specialty Pigment Manufacturing: Used in the synthesis of high-performance organic pigments for inks, coatings, and plastics requiring excellent color strength and lightfastness.
• Functional Colorants: Serves as a precursor for dyes used in non-textile applications, such as laser dyes, optical data storage media, and electrochromic devices.
• Research & Development: A valuable reagent in chemical research for developing novel chromophores and studying structure-property relationships in dye chemistry.
• Analytical Chemistry: Can be utilized as a staining agent or a complexometric indicator in specific analytical methodologies.

Basic Information

Product Name	1-Amino-9,10-Dihydro-9,10-Dioxo-4-p-Toluenesulphonamidoanthracene-2-Sulphonic Acid
CAS No.	128-98-3
Molecular Formula	C21H16N2O7S2
Molecular Weight	472.49 g/mol
Synonyms	4-[(4-Methylphenyl)sulfonyl]amino-1-aminoanthraquinone-2-sulfonic acid; 1-Amino-4-(p-tolylsulfonamido)anthraquinone-2-sulfonic acid; C.I. 62055; Acid Blue 45 intermediate; 1-Amino-4-(p-toluenesulfonamido)anthraquinone-2-sulfonic acid; 4-(p-Toluenesulfonamido)-1-aminoanthraquinone-2-sulfonic acid; ATSSA; Contact for additional synonyms.
EINECS	204-915-4

Quality Control

Our production of 1-Amino-9,10-Dihydro-9,10-Dioxo-4-p-Toluenesulphonamidoanthracene-2-Sulphonic Acid adheres to stringent quality management protocols to ensure batch-to-batch consistency and purity for industrial synthesis. Each lot is analyzed against rigorous in-house specifications, which typically include identity confirmation, assay (purity), and control of key impurities. Certificates of Analysis (COA) detailing all test results are provided with every shipment to support your quality assurance and regulatory compliance needs.

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). This compound is hygroscopic (moisture-sensitive); therefore, the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect purity and handling properties.

Specification

Item	Specification
Appearance	Dark brown to reddish-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

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