Write the appropriate reagent over each arrow.

Epoxidation is a chemical reaction that converts alkenes into epoxides, which are three-membered cyclic ethers. This reaction typically involves the addition of an oxygen atom across the double bond of the alkene, resulting in a highly reactive epoxide. Common reagents for epoxidation include peracids, such as m-chloroperbenzoic acid (MCPBA), which facilitate the formation of the epoxide by transferring an oxygen atom.

In organic chemistry, reagents are substances that cause a chemical reaction to occur. They can be acids, bases, oxidizing agents, or other compounds that facilitate the transformation of reactants into products. Identifying the correct reagents is crucial for predicting the outcome of a reaction, as they determine the mechanism and the nature of the products formed.

The mechanism of epoxidation typically involves the formation of a cyclic transition state where the alkene reacts with the reagent, leading to the formation of the epoxide. This process can proceed via a concerted mechanism, where bond formation and breaking occur simultaneously, or through a stepwise mechanism involving intermediates. Understanding the mechanism helps in predicting regioselectivity and stereochemistry of the epoxide formed.