Description

4-Phenylethynylphthalic Acid CAS NO 219537-88-9 is a specialized aromatic carboxylic acid derivative featuring a phenylethynyl substituent. This compound serves as a valuable high-purity building block and key intermediate in advanced organic synthesis. It is primarily required by R&D laboratories and industrial manufacturers in the pharmaceutical, agrochemical, and materials science sectors for developing novel active ingredients and functional polymers.

Application

• Pharmaceutical Intermediate: A crucial precursor in the synthesis of novel drug candidates, particularly for targeted therapies.
• Agrochemical Synthesis: Used in the research and development of new herbicides, fungicides, and plant growth regulators.
• Polymer & Material Science: Acts as a monomer or cross-linking agent for producing high-performance polymers, resins, and advanced materials with specific thermal or mechanical properties.
• Liquid Crystal & OLED Materials: Serves as a core component in the synthesis of organic electronic materials for displays and lighting.
• Academic & Industrial R&D: Employed in chemical research for studying reaction mechanisms and developing new synthetic methodologies.
• Fine Chemical Production: Utilized as a building block for synthesizing complex, high-value specialty chemicals.

Basic Information

Product Name	4-Phenylethynylphthalic Acid
CAS No.	219537-88-9
Molecular Formula	C₁₆H₁₀O₄
Molecular Weight	266.25 g/mol
Synonyms	4-(2-Phenylethynyl)phthalic Acid; 4-(Phenylethynyl)phthalic Acid; 1,2-Benzenedicarboxylic acid, 4-(2-phenylethynyl)-; 4-Phenylethynyl-1,2-benzenedicarboxylic Acid; 4-(Phenylethynyl)benzene-1,2-dicarboxylic Acid; 4-[(Phenylacetylene)phthalic Acid]; PEP Acid (abbreviation)
EINECS	Contact for details

Quality Control

Our 4-Phenylethynylphthalic Acid is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing, including HPLC, NMR, and IR spectroscopy, to ensure high chemical purity and structural identity. Certificates of Analysis (COA) with detailed specifications are provided and available upon request to support your quality assurance protocols.

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.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
Residue on Ignition	≤ 0.1%
Heavy Metals (as Pb)	≤ 10 ppm
Single Unknown Impurity (HPLC)	≤ 0.5%
Total Impurities (HPLC)	≤ 2.0%

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