Description

2-Nitroso-1-Naphthol-4-Sulfonic Acid is a specialized organic intermediate featuring both nitroso and sulfonic acid functional groups on a naphthalene backbone. This unique structure makes it a valuable precursor in the synthesis of dyes, pigments, and analytical reagents. It is primarily sought after by manufacturers and R&D laboratories in the fine chemical, dye, and analytical chemistry sectors for its role in creating complex molecules and colorants.

Application

• Dye and Pigment Intermediate: A key building block in the synthesis of azo dyes and complex organic pigments.
• Analytical Chemistry Reagent: Used as a chelating agent for the detection and spectrophotometric determination of metal ions, particularly cobalt.
• Fine Chemical Synthesis: Serves as a versatile intermediate in pharmaceutical and agrochemical research for constructing naphthalene-based compounds.
• Photographic Chemicals: Employed in the formulation of certain light-sensitive materials and photographic developers.
• Corrosion Inhibitor Formulation: Acts as a component in specialized formulations designed to protect metal surfaces.
• Polymer Modification: Used to introduce functional groups into polymers for enhanced properties.

Basic Information

Product Name	2-Nitroso-1-Naphthol-4-Sulfonic Acid
CAS No.	3682-32-4
Molecular Formula	C₁₀H₇NO₅S
Molecular Weight	253.23 g/mol
Synonyms	1-Nitroso-2-naphthol-4-sulfonic acid; 2-Nitroso-1-naphthol-4-sulfonic acid; 1,2-Naphthoquinone-1-oxime-4-sulfonic acid; Nitroso R salt; NSC 403697; Cobalt reagent; 4-Sulfo-1,2-naphthoquinone-1-oxime
EINECS	222-974-1

Quality Control

Our 2-Nitroso-1-Naphthol-4-Sulfonic Acid is manufactured under a strict quality management system. Each batch is analyzed to ensure it meets high-purity standards suitable for industrial and laboratory applications. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with every shipment to guarantee consistent quality and traceability.

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 tightly sealed after use to prevent absorption of atmospheric moisture, which can affect product quality.

Specification

Item	Specification
Appearance	Yellow to orange-brown crystalline powder
Identification (IR)	Conforms
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.