Carbonyl chloride, commonly known as phosgene, is a colorless gas with a musty odor. It is primarily used in the production of isocyanates and pharmaceuticals, making it an important chemical in various industrial processes. Phosgene is highly toxic and can cause severe respiratory damage if inhaled. This compound has the chemical formula COCl2 and is classified as an acyl chloride. It is produced by reacting carbon monoxide with chlorine gas. Due to its hazardous nature, strict safety measures are necessary when handling phosgene to prevent accidental exposure and ensure safe usage in laboratories and manufacturing facilities.