Description

4-Methyl-3A,4,7,7A-Tetrahydroisobenzofuran-1,3-Dione is a specialized bicyclic anhydride compound with significant utility as a versatile chemical intermediate. Its unique fused-ring structure makes it a valuable building block for synthesizing complex molecules, particularly in the development of advanced polymers, resins, and fine chemicals. This product is essential for R&D chemists and process engineers in the pharmaceutical, agrochemical, and performance materials industries seeking to introduce specific functional groups and structural complexity into their target compounds.

Application

• Pharmaceutical Intermediate: A key precursor in the synthesis of active pharmaceutical ingredients (APIs) and other bioactive molecules.
• Polymer & Resin Modification: Used as a curing agent or cross-linking monomer to enhance the thermal and mechanical properties of epoxy, polyester, or polyimide resins.
• Agrochemical Synthesis: Serves as a building block for creating novel herbicides, fungicides, and plant growth regulators.
• Fine Chemical Production: Employed in the manufacture of dyes, pigments, and other specialty organic compounds.
• Academic & Industrial Research: A valuable reagent for methodological development and exploring new chemical reactions in organic synthesis.
• Adhesive & Coating Formulations: Can be incorporated to improve adhesion, chemical resistance, and durability in high-performance coatings.

Basic Information

Product Name	4-Methyl-3A,4,7,7A-Tetrahydroisobenzofuran-1,3-Dione
CAS No.	35438-82-5
Molecular Formula	C9H10O3
Molecular Weight	166.17 g/mol
Synonyms	4-Methyl-4,7-epoxyisobenzofuran-1,3-dione; 4-Methyl-1,3-isobenzofurandione, 3a,4,7,7a-tetrahydro-; 3a,4,7,7a-Tetrahydro-4-methyl-1,3-isobenzofurandione; 4-Methyl-3a,4,7,7a-tetrahydro-1,3-isobenzofurandione; 4-Methylhexahydrophthalic anhydride (mixture of isomers); MHPA; Methylhexahydrophthalic anhydride (related isomer)
EINECS	Contact for details

Quality Control

Our 4-Methyl-3A,4,7,7A-Tetrahydroisobenzofuran-1,3-Dione is produced under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure high purity, consistency, and compliance with customer specifications. Comprehensive Certificates of Analysis (COA) detailing identity, assay, and impurity profiles are 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). This product is hygroscopic (moisture-sensitive) and must be kept under dry conditions to prevent decomposition. Keep away from heat, sparks, open flames, and incompatible materials such as strong bases and amines.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Melting Point	Contact for details
Water Content (KF)	≤ 0.5%
Related Substances (HPLC)	Individual impurity ≤ 0.5%; Total impurities ≤ 1.5%

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