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Propiolic Acid

Updated: 2026-07-15

Overview

Propiolic acid, also known as propynoic acid, is an unsaturated carboxylic acid with the molecular formula C3H2O2. It is characterized by a triple bond between the second and third carbon atoms, making it highly reactive. The compound is commonly used in organic synthesis and as an intermediate in pharmaceutical manufacturing. Due to its reactivity, propiolic acid is often employed in the production of more complex organic compounds. Its applications span across various industries, including pharmaceuticals, agrochemicals, and specialty chemicals. The acid is typically stored under controlled conditions to prevent degradation and ensure safety.

Physical and Chemical Properties

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Propiolic acid is a colorless liquid with a pungent odor. It has a density of 1.14 g/cm³ and a boiling point of 144°C. The compound is soluble in water, ethanol, and ether, making it versatile for various chemical reactions. Its highly reactive nature is attributed to the presence of a triple bond, which readily participates in addition reactions. Propiolic acid is also corrosive and flammable, necessitating careful handling and storage. These properties make it a valuable but challenging reagent in industrial and laboratory settings.

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Main Applications

Propiolic acid is primarily used in organic synthesis, where it serves as a building block for more complex molecules. It is a key intermediate in the production of pharmaceuticals, including antiviral and anticancer drugs. In addition to pharmaceuticals, the acid is used in the synthesis of agrochemicals and specialty chemicals. Its ability to form stable derivatives makes it a preferred choice for researchers and manufacturers. The compound's versatility ensures its continued relevance in various chemical industries.

Safety and Storage

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Due to its corrosive and flammable nature, propiolic acid requires strict safety measures. It should be stored in a cool, dry, well-ventilated area away from heat sources and open flames. Protective gear, including gloves and goggles, is essential when handling the compound. In case of spills, neutralization with a weak base is recommended. Proper disposal methods must be followed to prevent environmental contamination. Safety data sheets (SDS) should always be consulted before use to ensure compliance with regulatory standards.

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B2B Procurement Guide

When procuring propiolic acid, buyers should verify the CAS number (471-25-0) to ensure product authenticity. Purity levels, typically ranging from 95% to 99%, should be confirmed based on intended use. Reputable suppliers with certifications such as ISO or GMP are preferred. Bulk purchases may offer cost advantages, but storage conditions must be evaluated. Buyers should also consider logistics, including shipping and handling requirements, to maintain product integrity.

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