Propionic acid derivatives are chemical compounds that are derived from propionic acid, a carboxylic acid with the formula C3H6O2. These derivatives can include esters, amides, and salts, which are formed by modifying the propionic acid structure. They are commonly used in various applications, including food preservation, pharmaceuticals, and agricultural chemicals. These compounds are known for their antimicrobial properties, making them effective in preventing spoilage in food products. Additionally, some propionic acid derivatives serve as intermediates in the synthesis of more complex organic molecules, contributing to the development of new materials and drugs in the chemical industry.