Description

1,3-Dihydro-1,3-Dioxoisobenzofuran-4-Sulphonic Acid is a key sulfonated phthalic anhydride derivative, serving as a versatile intermediate in advanced chemical synthesis. Its primary value lies in introducing the sulfonic acid functional group, which imparts water solubility, acidity, and metal-chelating properties to target molecules. This compound is essential for manufacturers in the pharmaceutical, agrochemical, and specialty dye industries seeking to develop products with enhanced performance characteristics.

Application

• Pharmaceutical Intermediate: Used in the synthesis of active pharmaceutical ingredients (APIs), particularly those requiring sulfonamide or water-solubilizing groups.
• Agrochemical Synthesis: Serves as a building block for creating modern herbicides and fungicides with improved systemic activity.
• Dye and Pigment Manufacturing: Acts as a precursor for sulfonated dyes, enhancing their affinity for textile fibers and solubility in aqueous media.
• Polymer Modification: Incorporated into polymer chains to introduce ionic character, improving hydrophilicity and antistatic properties.
• Chemical Research & Development: A valuable reagent for organic chemists exploring new sulfonation reactions and creating novel molecular architectures.
• Catalyst and Ligand Preparation: Used to synthesize specialized ligands for metal catalysis and complexation processes.

Basic Information

Item	Details
Product Name	1,3-Dihydro-1,3-Dioxoisobenzofuran-4-Sulphonic Acid
CAS No.	28181-92-2
Molecular Formula	C8H4O6S
Molecular Weight	228.18 g/mol
Synonyms	4-Sulfophthalic Anhydride; 4-Sulphoisobenzofuran-1,3-dione; Phthalic Anhydride-4-sulfonic Acid; 1,3-Dioxo-1,3-dihydroisobenzofuran-4-sulfonic Acid; Isobenzofuran-1,3-dione, 4-sulfo-; 4-Carboxybenzenesulfonic Acid Anhydride; 4-Sulfobenzoic Acid Anhydride
EINECS	Contact for details

Quality Control

Our production of 1,3-Dihydro-1,3-Dioxoisobenzofuran-4-Sulphonic Acid adheres to stringent quality management protocols to ensure batch-to-batch consistency and reliability. Each lot is analyzed against comprehensive specifications, including identity confirmation by FT-IR, purity assessment by HPLC, and control of key impurities. A Certificate of Analysis (COA) detailing all test results is provided with every shipment, supporting compliance in regulated applications.

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). This product is hygroscopic (moisture-sensitive); the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can lead to hydrolysis and reduced efficacy.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Residue on Ignition	≤ 0.1%

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