Chloromethylation is a chemical process that introduces a chloromethyl group (-CH2Cl) into organic compounds. This reaction typically involves the use of chloromethyl methyl ether (CMME) or other chloromethylating agents, which react with various substrates, such as aromatic compounds or alcohols. The process is valuable in organic synthesis for creating intermediates that can be further transformed into more complex molecules. The chloromethylation reaction is often used in the production of pharmaceuticals, agrochemicals, and other fine chemicals. It allows for the modification of molecular structures, enhancing their reactivity and enabling the development of new compounds with desired properties.