Description

3,5-Dichlorophthalic Anhydride is a halogenated aromatic anhydride derivative, serving as a critical high-purity synthetic intermediate. Its value lies in its dual reactive sites, enabling the controlled synthesis of complex molecules with specific functional properties. This compound is essential for manufacturers in the pharmaceutical, agrochemical, and advanced polymer industries seeking to develop new active ingredients and high-performance materials.

Application

• Pharmaceutical Intermediate: Key building block in the synthesis of active pharmaceutical ingredients (APIs), particularly for compounds requiring a rigid, halogenated aromatic core.
• Agrochemical Synthesis: Used in the production of advanced herbicides, fungicides, and plant growth regulators where the dichloro-substitution pattern imparts specific biological activity.
• Polymer & Resin Modifier: Acts as a monomer or cross-linking agent in the manufacture of high-temperature resistant polyimides, epoxy resins, and other specialty polymers.
• Dye & Pigment Manufacturing: Intermediate for creating complex organic pigments and dyes with enhanced lightfastness and color properties.
• Organic Synthesis Reagent: Utilized in research and development for constructing complex organic molecules, including ligands for catalysis and materials for organic electronics.

Basic Information

Product Name	3,5-Dichlorophthalic Anhydride
CAS No.	51971-64-3
Molecular Formula	C8H2Cl2O3
Molecular Weight	217.00 g/mol
Synonyms	3,5-Dichlorophthalic anhydride; 4,6-Dichloroisobenzofuran-1,3-dione; 3,5-Dichloro-1,3-dihydroisobenzofuran-1,3-dione; 1,3-Isobenzofurandione, 4,6-dichloro-; 3,5-Dichlorophthalic acid anhydride; Phthalic anhydride, 3,5-dichloro-; DCPhA
EINECS	Contact for details

Quality Control

Our 3,5-Dichlorophthalic Anhydride is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets high-purity standards suitable for sensitive synthetic applications. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with every shipment to guarantee traceability and consistency for your quality assurance processes.

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) and must be kept under dry conditions to prevent hydrolysis and degradation. Keep away from strong bases and oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Melting Point	164 - 168 °C
Loss on Drying	≤ 0.5%
Residue on Ignition	≤ 0.1%

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