Description

m-[[4-[(4-Hydroxy-m-Tolyl)Azo]-3-Methoxyphenyl]Azo]Benzenesulphonic Acid is a specialized azo dye intermediate characterized by its distinct sulfonic acid and methoxy-substituted aromatic structure. This compound matters for its role as a key precursor in the synthesis of high-performance, water-soluble dyes and pigments, offering excellent color fastness and compatibility with various substrates. Industrial manufacturers in the textile, ink, and specialty chemical sectors require this intermediate to produce vivid and durable colorants for fabrics, printing applications, and advanced materials.

Application

• Primary intermediate for the synthesis of acid dyes and direct dyes used in textile coloration, particularly for wool, silk, and nylon.
• Key building block in manufacturing pigments and colorants for inks, including those used in packaging and commercial printing.
• Used in the production of specialty dyes for leather, paper, and food contact materials where specific solubility and stability are required.
• Potential precursor for functional dyes in non-textile applications such as sensors, optical data storage, and liquid crystal displays (LCDs).
• Employed in research and development laboratories for creating novel azo compounds with tailored properties.
• May serve as a chemical intermediate in organic synthesis for introducing specific chromophoric and solubilizing groups.

Basic Information

Product Name	m-[[4-[(4-Hydroxy-m-Tolyl)Azo]-3-Methoxyphenyl]Azo]Benzenesulphonic Acid
CAS No.	51988-22-8
Molecular Formula	C26H22N4O5S
Molecular Weight	502.54 g/mol
Synonyms	Benzenesulfonic acid, m-[[4-[(4-hydroxy-m-tolyl)azo]-3-methoxyphenyl]azo]-; 3-[[4-[(4-Hydroxy-3-methylphenyl)azo]-3-methoxyphenyl]azo]benzenesulfonic acid; Azo dye intermediate 51988-22-8; CI 14720 (related); Acid Orange 33 precursor; m-(4-[(4-Hydroxy-m-tolyl)azo]-3-methoxyphenyl)azobenzenesulfonic acid; 3-[(4-[(4-Hydroxy-3-methylphenyl)diazenyl]-3-methoxyphenyl)diazenyl]benzenesulfonic acid
EINECS	Contact for details

Quality Control

Our production of m-[[4-[(4-Hydroxy-m-Tolyl)Azo]-3-Methoxyphenyl]Azo]Benzenesulphonic Acid adheres to stringent quality management protocols to ensure batch-to-batch consistency and purity. The material undergoes rigorous analytical testing, including HPLC for assay and impurity profiling, to meet precise customer specifications. Certificates of Analysis (COA) detailing identity, purity, and physical parameters are provided with each 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 a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed when not in use to prevent absorption of atmospheric moisture, which can affect product quality and handling properties.

Specification

Item	Specification
Appearance	Orange to brown powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 3.0%
Solubility (1% in Water)	Clear, orange solution

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