Cyclopropanation is a chemical reaction that involves the formation of a cyclopropane ring from an alkene. This process typically occurs when a reagent, such as diazomethane or carbene, adds across the double bond of the alkene, resulting in a three-membered carbon ring. Cyclopropanation is significant in organic chemistry due to the unique properties of cyclopropane derivatives. The resulting cyclopropane structure is highly strained, which can lead to interesting reactivity and stability characteristics. Cyclopropanation is widely used in the synthesis of various organic compounds, including pharmaceuticals and agrochemicals, making it an important tool for chemists in developing new materials.