Description

1,3-Isobenzofurandione,4,5-Dimethyl-(9Ci) is a specialized dimethyl-substituted phthalic anhydride derivative, identified by CAS NO 5555-21-5. This compound serves as a versatile and reactive chemical intermediate, valued for its ability to introduce the dimethylphthalic moiety into more complex molecular structures. It is primarily required by R&D chemists and process engineers in the fine chemical, pharmaceutical, and advanced polymer industries for synthesis and material modification.

Application

• Pharmaceutical Intermediate: Key building block in the synthesis of active pharmaceutical ingredients (APIs) and other bioactive molecules.
• Polymer Chemistry: Used as a monomer or modifier in the production of specialty polyimides, polyesters, and epoxy resins, enhancing material properties.
• Dye and Pigment Synthesis: Serves as a precursor in the manufacture of advanced colorants and optical materials.
• Agrochemical Development: Intermediate in the research and production of modern pesticides and herbicides.
• Fine Chemical Synthesis: Employed in organic synthesis for creating complex molecules in research and scale-up laboratories.
• Cross-linking Agent: Functions as a cross-linker in specific polymer systems to improve thermal and mechanical stability.

Basic Information

Product Name	1,3-Isobenzofurandione,4,5-Dimethyl-(9Ci)
CAS No.	5555-21-5
Molecular Formula	C10H8O3
Molecular Weight	176.17 g/mol
Synonyms	4,5-Dimethylphthalic Anhydride; 4,5-Dimethyl-1,3-isobenzofurandione; 4,5-Dimethylphthalic Acid Anhydride; 1,3-Dioxo-4,5-dimethyl-1,3-dihydro-2-benzofuran; 4,5-Dimethyl-1,3-dihydro-2-benzofuran-1,3-dione; 4,5-Dimethylbenzofurandione; 4,5-Dimethyl-2-benzofuran-1,3-dione
EINECS	Contact for details

Quality Control

Our 1,3-Isobenzofurandione,4,5-Dimethyl-(9Ci) is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure identity, purity, and consistency. We provide comprehensive Certificates of Analysis (COA) with key parameters including assay, impurity profile, and physical characteristics. Our quality commitment supports applications requiring high-purity intermediates.

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 to prevent degradation from atmospheric moisture.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0%
Melting Point	Contact for details
Loss on Drying	≤ 1.0%
Heavy Metals	< 20 ppm

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