Oxalyl chloride is a chemical compound with the formula C2Cl2O2. It appears as a colorless liquid and is known for its strong, pungent odor. This compound is primarily used as a reagent in organic synthesis, particularly for converting carboxylic acids into acid chlorides. In addition to its role in synthesis, oxalyl chloride is also utilized in the production of various pharmaceuticals and agrochemicals. It is important to handle this compound with care, as it can be hazardous and may cause irritation to the skin, eyes, and respiratory system.