Description

3-Chlorophthalic Anhydride is a versatile halogenated aromatic anhydride serving as a critical synthetic intermediate in advanced organic chemistry. Its value lies in its bifunctional reactivity, allowing it to act as both an electrophile and a precursor for the introduction of the phthalimide and chlorophenyl moieties. This compound is essential for manufacturers and R&D teams 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 fused ring systems.
• Agrochemical Synthesis: Used in the production of herbicides, fungicides, and plant growth regulators.
• Dye and Pigment Manufacturing: Serves as a precursor for chlorinated phthalocyanine dyes and other complex colorants.
• Polymer Modifier: Incorporated into polyimides and epoxy resins to enhance thermal stability and flame retardancy.
• Organic Synthesis Reagent: Employed in laboratories for constructing complex heterocyclic compounds and in peptide coupling reactions.
• Liquid Crystal & OLED Material Precursor: Used in the development of advanced electronic and optoelectronic materials.

Basic Information

Product Name	3-Chlorophthalic Anhydride
CAS No.	117-21-5
Molecular Formula	C8H3ClO3
Molecular Weight	182.56 g/mol
Synonyms	3-Chlorophthalic Acid Anhydride; 4-Chloroisobenzofuran-1,3-dione; 1,3-Isobenzofurandione, 4-chloro-; 3-Chloro-1,2-benzenedicarboxylic Anhydride; NSC 403107; 3-Chlorophthalsäureanhydrid (German); Anhydride 3-chlorophthalique (French)
EINECS	204-176-5

Quality Control

Our 3-Chlorophthalic Anhydride is produced under a strict quality management system. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation by IR spectroscopy, to ensure it meets precise specifications for industrial and research applications. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee traceability and compliance with your quality requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from strong bases, oxidizing agents, and moisture.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Melting Point	124 - 128 °C
Loss on Drying	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

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