Description

3,6-Dichlorophthalic Anhydride is a halogenated aromatic anhydride derivative, serving as a critical high-purity synthetic intermediate in advanced chemical manufacturing. Its value lies in its dual reactive sites, enabling the construction of complex molecular architectures with precise functionality. This compound is essential for R&D and production chemists in the pharmaceutical, agrochemical, and specialty polymer industries seeking to develop new active ingredients and high-performance materials.

Application

• Pharmaceutical Intermediate: Key building block for the synthesis of active pharmaceutical ingredients (APIs), particularly those with complex polycyclic structures.
• 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: Serves as a monomer or cross-linking agent in the manufacture of high-temperature resistant polyimides, epoxy resins, and other specialty polymers.
• Dye & Pigment Precursor: Intermediate in the synthesis of complex organic pigments and dyes, contributing to color fastness and stability.
• Organic Synthesis Reagent: Versatile reagent in academic and industrial laboratories for constructing phthalimide derivatives and other nitrogen-containing heterocycles.
• Material Science Research: Used in developing novel organic electronic materials, such as semiconductors for OLEDs or photovoltaics.

Basic Information

Product Name	3,6-Dichlorophthalic Anhydride
CAS No.	4466-59-5
Molecular Formula	C8H2Cl2O3
Molecular Weight	217.00 g/mol
Synonyms	3,6-Dichlorophthalic Acid Anhydride; 3,6-Dichloro-1,3-dihydroisobenzofuran-1,3-dione; 3,6-Dichlorophthalic Acid 1,3-Anhydride; NSC 403107; 1,3-Dioxo-1,3-dihydroisobenzofuran-5,8-diyl dichloride; 5,8-Dichloroisobenzofuran-1,3-dione; 3,6-Dichlorophthalsäureanhydrid (German)
EINECS	224-724-9

Quality Control

Our 3,6-Dichlorophthalic Anhydride is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets exacting standards for use as a synthetic intermediate. Certificates of Analysis (COA) detailing batch-specific results are provided and available upon request to support your quality assurance and regulatory compliance needs.

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 tightly sealed after opening to prevent degradation from atmospheric moisture. Keep away from 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	188°C - 192°C
Loss on Drying	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Residue on Ignition	≤ 0.1%
Single Impurity (HPLC)	≤ 1.0%

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