Description

4-Chlorophthalic Acid is a key halogenated aromatic dicarboxylic acid derivative, serving as a versatile and high-value building block in advanced organic synthesis. Its primary commercial value lies in its bifunctional reactivity, enabling the construction of complex molecular architectures for high-performance materials and active pharmaceutical ingredients. This compound is essential for R&D chemists and process engineers in the pharmaceutical, agrochemical, and specialty polymer industries seeking to introduce chlorinated aromatic motifs and carboxylic acid functionalities into their target molecules.

Application

• Pharmaceutical Intermediates: A critical precursor in the synthesis of active pharmaceutical ingredients (APIs), particularly for compounds requiring a chlorinated phthalic acid core.
• Agrochemical Synthesis: Used in the manufacture of herbicides, fungicides, and plant growth regulators where the chlorophthalic structure imparts specific biological activity.
• Polymer & Resin Modifiers: Serves as a monomer or cross-linking agent in the production of specialty polyesters, polyamides, and epoxy resins, enhancing thermal stability and chemical resistance.
• Dye & Pigment Manufacturing: Acts as an intermediate in the synthesis of complex organic pigments and dyes, contributing to color fastness and molecular stability.
• Liquid Crystal & OLED Materials: Employed in the development of advanced electronic display materials due to its rigid, planar aromatic structure and functional handles for further derivatization.
• Corrosion Inhibitors: Used in formulations for metal surface treatments and coatings.
• Research & Development: A valuable reagent in academic and industrial laboratories for exploring new synthetic methodologies and creating novel chemical entities.

Basic Information

Product Name	4-Chlorophthalic Acid
CAS No.	89-20-3
Molecular Formula	C8H5ClO4
Molecular Weight	200.57 g/mol
Synonyms	4-Chlorobenzene-1,2-dicarboxylic Acid; 4-Chloro-1,2-benzenedicarboxylic Acid; 1,2-Benzenedicarboxylic Acid, 4-Chloro-; NSC 403697; 4-Chlorophthalic Acid (technical grade); 4-CPA; p-Chlorophthalic Acid
EINECS	201-886-1

Quality Control

Our 4-Chlorophthalic Acid is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure identity, purity, and consistency. We provide a detailed Certificate of Analysis (COA) with each shipment, documenting key parameters such as assay, impurity profile, and physical characteristics. Our quality commitment ensures the material meets the stringent requirements for use in regulated synthesis and industrial applications.

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). Keep away from strong bases, strong oxidizing agents, and sources of ignition. The container should be kept tightly sealed to minimize exposure to atmospheric moisture.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Melting Point	185 - 190 °C
Loss on Drying	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Residue on Ignition	≤ 0.1%

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