Cyclization refers to the process of forming a cyclic compound from a linear precursor molecule. This can occur through various chemical reactions, such as ring-closing reactions, which involve the formation of one or more covalent bonds to create a cyclic structure. Cyclization is a key strategy in organic synthesis for the construction of complex molecules with unique properties and functions. It is commonly used in medicinal chemistry, natural product synthesis, and materials science to create compounds with specific biological activities or structural motifs. Cyclization reactions are often highly selective and can lead to the development of new drugs, materials, and other important chemical compounds.