Phosphorus trichloride is a chemical compound with the formula PCl3. It is a colorless, oily liquid that has a pungent odor. This compound is primarily used in the production of various chemicals, including phosphorus oxychloride and phosphorus pentachloride. It is also utilized in the manufacture of pesticides and flame retardants. Phosphorus trichloride is produced by reacting phosphorus with chlorine gas. It is important to handle this substance with care, as it can be toxic and corrosive. Proper safety measures, such as using protective equipment, are essential when working with PCl3 to prevent exposure and chemical burns.