Description

5-Isatinsulfonic Acid Sodium Salt is a high-purity, water-soluble derivative of isatin, serving as a versatile synthetic intermediate and analytical reagent. Its sulfonic acid sodium salt form offers enhanced stability and solubility in aqueous systems, which is critical for controlled chemical synthesis and process consistency. This compound is primarily required by manufacturers in the pharmaceutical, dye, and fine chemical sectors for the development of active pharmaceutical ingredients (APIs), specialized pigments, and advanced organic molecules.

Application

• Pharmaceutical Intermediate: Key building block in the synthesis of complex heterocyclic compounds and potential drug candidates.
• Dye and Pigment Manufacturing: Used as a precursor for synthesizing sulfonated dyes and specialty colorants with improved water solubility.
• Analytical Chemistry: Employed as a reagent or standard in chromatographic analysis and spectroscopic studies.
• Biochemical Research: Utilized in proteomics and enzyme studies as a modifying agent or probe due to its reactive isatin core.
• Fine Chemical Synthesis: Serves as a starting material for creating complex organic molecules used in agrochemicals and material science.
• Cross-coupling Reactions: Acts as a substrate in metal-catalyzed reactions for constructing novel chemical architectures.

Basic Information

Item	Detail
Product Name	5-Isatinsulfonic Acid Sodium Salt
CAS No.	303137-11-3
Molecular Formula	C8H4NNaO5S
Molecular Weight	249.17 g/mol
Synonyms	5-Sulfoisatin Sodium Salt; Sodium 5-Isatinsulfonate; Isatin-5-sulfonic Acid Sodium Salt; 1H-Indole-2,3-dione 5-sulfonic Acid Sodium Salt; 5-Sulfonatoisatin Sodium Salt; 2,3-Dioxoindoline-5-sulfonate Sodium Salt
EINECS	Contact for details

Quality Control

Our 5-Isatinsulfonic Acid Sodium Salt is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing, including HPLC for purity, IR for identification, and loss on drying for moisture content, to ensure it meets exacting standards for research and industrial use. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee traceability and compliance.

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 to minimize exposure to atmospheric humidity.

Specification

Item	Specification
Appearance	Yellow to orange-yellow powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Heavy Metals (as Pb)	≤ 20 ppm
Residue on Ignition	≤ 0.5%
Solubility (Water)	Clear, yellow solution

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