Description

6,7-Dihydroxynaphthalene-2-Sulfonic Acid is a versatile aromatic sulfonic acid derivative characterized by its dihydroxy substitution pattern. This compound is a valuable intermediate in the synthesis of dyes, pigments, and specialty chemicals, offering critical functional groups for coupling and complexation reactions. It is primarily sought after by manufacturers in the dye and pigment, pharmaceutical, and fine chemical industries for its role in creating colorants and functional molecules.

Application

• Dye and Pigment Intermediate: A key precursor in the manufacture of azo dyes, acid dyes, and metal-complex pigments, contributing to color fastness and hue.
• Pharmaceutical Synthesis: Serves as a building block for active pharmaceutical ingredients (APIs) and diagnostic agents due to its reactive hydroxyl and sulfonic acid groups.
• Chemical Research & Development: Used in organic synthesis and as a ligand or chelating agent in catalytic and analytical chemistry.
• Photographic Chemicals: Employed in the formulation of certain developers and sensitizers.
• Corrosion Inhibitor Formulation: Can be utilized in specialty chemical blends for metal surface treatment.
• Analytical Reagent: Acts as a chromogenic agent or standard in various analytical methods.

Basic Information

Product Name	6,7-Dihydroxynaphthalene-2-Sulfonic Acid
CAS No.	92-27-3
Molecular Formula	C₁₀H₈O₆S
Molecular Weight	256.23 g/mol
Synonyms	2,3-Dihydroxynaphthalene-6-sulfonic Acid; 6,7-Dihydroxy-2-naphthalenesulfonic Acid; 2-Naphthalenesulfonic acid, 6,7-dihydroxy-; Chromotropic Acid (Note: Often refers to the 1,8-isomer, but this is a related compound); 6,7-Dihydroxynaphthalenesulfonic Acid; C.I. 37275; Acid Chrome Blue K
EINECS	202-141-2

Quality Control

Our 6,7-Dihydroxynaphthalene-2-Sulfonic Acid is produced under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure identity, purity, and consistency. A Certificate of Analysis (COA) detailing specifications such as assay, impurity profile, and physical characteristics is provided and available upon request to support your quality assurance protocols.

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 sealed to prevent absorption of atmospheric moisture. Keep away from strong bases and oxidizing agents.

Specification

Item	Specification
Appearance	Off-white to light brown powder or crystals
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
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.