Description

4-Ethynylbenzene-1,2-Dioic Acid is a high-purity, multifunctional organic building block featuring both a carboxylic acid and an ethynyl group on a benzene ring. This unique structure makes it a valuable intermediate for synthesizing complex molecules in advanced material and pharmaceutical research. It is particularly sought after by R&D chemists and process development scientists in the fields of medicinal chemistry, polymer science, and materials engineering. The compound, identified by CAS No. 87639-56-3, is supplied to meet the stringent requirements of laboratory and pilot-scale production.

Application

• Pharmaceutical Intermediate: Serves as a key precursor in the synthesis of active pharmaceutical ingredients (APIs) and drug candidates, particularly for creating novel molecular scaffolds.
• Polymer & Material Science: Used as a monomer or cross-linking agent in the development of specialty polymers, resins, and advanced functional materials.
• Ligand Synthesis: Employed in the preparation of sophisticated ligands for catalysis and metal-organic frameworks (MOFs).
• Organic Synthesis Building Block: Utilized in click chemistry (e.g., Huisgen cycloaddition) and other coupling reactions to introduce both aromatic and alkyne functionalities.
• Agrochemical Research: Acts as an intermediate in the development of new crop protection agents and herbicides.
• Dye & Pigment Intermediate: Used in the synthesis of complex organic dyes and pigments for high-performance applications.

Basic Information

Product Name	4-Ethynylbenzene-1,2-Dioic Acid
CAS No.	87639-56-3
Molecular Formula	C10H6O4
Molecular Weight	190.15 g/mol
Synonyms	4-Ethynylphthalic Acid; 4-Ethynyl-1,2-benzenedicarboxylic Acid; 4-Ethynylbenzene-1,2-dicarboxylic Acid; 1,2-Benzenedicarboxylic acid, 4-ethynyl-; 4-Ethynyl-o-phthalic Acid; 4-Ethynylphthalic Anhydride (precursor form)
EINECS	Contact for details

Quality Control

Our 4-Ethynylbenzene-1,2-Dioic Acid is manufactured under strict quality management systems. Every batch undergoes rigorous analytical testing to ensure identity, purity, and consistency. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing key parameters such as assay and impurity profiles. Our quality commitment supports applications in research and development where reliable purity and batch-to-batch consistency are critical.

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 acids and organic solvents. Due to its light-sensitive nature, prolonged exposure to light should be avoided.

Specification

Item	Specification
Appearance	White to off-white powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 97.0%
Melting Point	Contact for details
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.