Description

2,7-Naphthalenedisulfonic Acid, 5-(Benzoylamino)-3-6-(Ethenylsulfonyl)-1-Sulfo-2-Naphthalenylazo-4-Hydroxy- is a specialized, high-purity reactive dye intermediate of significant industrial importance. Its complex molecular structure, featuring azo, sulfonic acid, and ethenylsulfonyl groups, makes it a critical precursor for synthesizing advanced colorants with excellent wash-fastness and fiber reactivity. This compound is essential for manufacturers of high-performance dyes and pigments targeting the textile, ink, and specialty coatings industries, where consistent quality and precise chemical functionality are paramount.

Application

• Reactive Dye Synthesis: Primary intermediate for manufacturing high-quality fiber-reactive dyes, particularly for cotton and other cellulosic fibers.
• Textile Industry: Used in the production of dyes that form covalent bonds with fabric, resulting in brilliant, durable colors with superior wash and light fastness.
• Inkjet Ink Formulation: Key component in the synthesis of advanced colorants for high-resolution pigment-based inks.
• Specialty Pigments: Serves as a building block for creating complex organic pigments used in automotive paints and industrial coatings.
• Research & Development: Valuable chemical for R&D laboratories exploring new chromophores and functional dyes for optical or sensing applications.
• Leather Dyeing: Intermediate for dyes used in the leather processing industry to achieve deep, uniform coloration.

Basic Information

Item	Details
Product Name	2,7-Naphthalenedisulfonic Acid, 5-(Benzoylamino)-3-6-(Ethenylsulfonyl)-1-Sulfo-2-Naphthalenylazo-4-Hydroxy-
CAS No.	123690-27-7
Molecular Formula	C29H21N3O11S4
Molecular Weight	715.74 g/mol
Synonyms	Reactive Black 5 Intermediate; 5-(Benzoylamino)-3-6-(ethenylsulfonyl)-1-sulfo-2-naphthalenylazo-4-hydroxy-2,7-naphthalenedisulfonic acid; C.I. Reactive Black 5 precursor; Vinylsulfonyl azo dye intermediate; 4-Hydroxy-5-[(2-hydroxy-1-naphthyl)azo]-2,7-naphthalenedisulfonic acid derivative; Benzoylamino naphthalene disulfonic acid azo compound; Ethenylsulfonyl reactive dye intermediate
EINECS	Contact for details

Quality Control

Every batch of our 2,7-Naphthalenedisulfonic Acid intermediate is produced under a strict quality management system. We employ advanced analytical techniques including HPLC, TLC, and spectrophotometry to ensure high purity and consistent chemical composition, which is critical for predictable dye synthesis performance. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and identification is provided with each shipment to guarantee it meets your specific application requirements.

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 purity and reactivity. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Dark blue to black powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Partially soluble, forms a colored solution

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