It has the chemical formula C2H2Cl2O and is primarily used in the preparation of herbicides. It is also useful as a chemical building block. The product is made by chlorinating acetyl chloride in the presence of stronger aliphatic acids. Furthermore, this chemical is used in the production of various pharmaceutical formulations. Chloroacetyl Chloride is used to make a variety of herbicides, including chloroacetyl chloride. Acid anhydrides are commonly used in the formulation of pharmaceuticals, industrial chemicals, and perfumes. It is also used in the production of aspirin and the synthesis of heroin via the diacetylation of morphine reaction.