CCl2O

CCl2O, also known as phosgene, is a chemical compound with the formula COCl2. It is a colorless, highly toxic gas with a pungent odor. Phosgene is primarily used as an intermediate in the production of isocyanates, which are used in the manufacture of polyurethane foams and coatings. It is also used in the production of certain pharmaceuticals and pesticides.

Phosgene is highly reactive and can react with water to form carbonic acid and hydrochloric acid. It can also react with alcohols to form chlorinated products. Due to its high toxicity, phosgene is handled with extreme care and is typically used in closed systems to prevent exposure to humans and the environment.

Phosgene was first synthesized in 1812 by French chemist Jean-Baptiste Dumas. It was later used during World War I as a chemical weapon, leading to its ban under the Geneva Protocol of 1925. Today, phosgene is primarily used in industrial settings and is regulated by various international treaties to prevent its misuse as a weapon.

The toxicity of phosgene is due to its ability to react with water in the body, forming hydrochloric acid and carbonic acid. This reaction can cause severe irritation and damage to the respiratory system, leading to symptoms such as coughing, shortness of breath, and in severe cases, death. Due to its high toxicity, phosgene is classified as a hazardous substance and is subject to strict regulations regarding its handling, storage, and disposal.