Thionyl Chloride is a chemical compound with the formula SOCl2. It is a colorless liquid that has a pungent odor and is primarily used as a reagent in organic synthesis. Thionyl chloride is known for its ability to convert alcohols into chlorides, making it valuable in the production of various chemicals. In addition to its role in organic chemistry, thionyl chloride is also used in the manufacture of pesticides and pharmaceuticals. It reacts with water to produce sulfur dioxide and hydrochloric acid, which can be hazardous. Proper safety measures are essential when handling this compound.