2-Ethynylbenzoic acid

Updated: 2026-07-21

Overview

2-Ethynylbenzoic acid is an organic compound featuring both an ethynyl group and a carboxyl group attached to a benzene ring. It is primarily utilized in pharmaceutical intermediates and organic synthesis due to its reactive functional groups. The compound is a white to off-white crystalline powder with moderate solubility in organic solvents. Its unique structure allows it to participate in various chemical reactions, making it valuable in the development of complex organic molecules. Researchers and manufacturers often seek high-purity forms of this compound for specialized applications.

Physical and Chemical Properties

2-Ethynylbenzoic acid has a molecular weight of 146.14 g/mol and typically appears as a white to off-white crystalline powder. It melts at approximately 150-155°C, though precise data may vary depending on purity. The compound is soluble in polar organic solvents like ethanol and dimethyl sulfoxide (DMSO) but has limited solubility in water. The presence of both ethynyl and carboxyl groups confers reactivity, enabling participation in coupling reactions, esterifications, and other synthetic transformations. Its stability under normal conditions makes it suitable for laboratory and industrial use, provided proper storage protocols are followed.

Main Applications

2-Ethynylbenzoic acid is widely used as a building block in pharmaceutical intermediates, contributing to the synthesis of active pharmaceutical ingredients (APIs). Its reactive ethynyl group is particularly valuable in click chemistry and other modular synthetic approaches. In material science, the compound serves as a precursor for polymers and specialty chemicals. Its dual functionality allows for the creation of complex architectures in advanced materials. Additionally, it finds niche applications in academic research for exploring new organic reactions and mechanisms.

Safety and Storage

Handling 2-ethynylbenzoic acid requires standard laboratory precautions, including the use of gloves, goggles, and proper ventilation. The compound may cause irritation upon contact with skin, eyes, or respiratory systems, and ingestion should be avoided. Storage recommendations include keeping the material in a cool, dry place, away from direct sunlight and moisture. Containers should be tightly sealed to prevent contamination and degradation. For large-scale industrial use, compliance with local chemical storage regulations is essential.

B2B Procurement Guide

When procuring 2-ethynylbenzoic acid, buyers should prioritize suppliers with a proven track record in chemical manufacturing. Key factors include purity levels (typically 95% or higher), batch consistency, and adherence to Good Manufacturing Practices (GMP). Request certificates of analysis (CoA) to verify quality and inquire about bulk pricing for cost efficiency. Lead times and logistics options should also be evaluated, especially for international shipments. Establish clear communication channels with suppliers to address any technical or regulatory concerns.