As molecules and ions with a ring of twelve or more atoms or more, macrocycles are frequently defined. Examples from the past include cyclodextrins, porphyrins, bioorthogonal nanocatalysts, and crown ethers. A vast and established field of chemistry is described by macrocycles. Macrocyclization refers to the process of creating macrocycles through ring-closure. For studies on terpenoid macrocycles, innovative work has been reported. The main obstacle to macrocyclization is the fact that ring-closing reactions do not encourage the formation of big rings. Small rings or polymers usually form as an alternative. High-dilution reactions, which favour intramolecular processes relative to polymerizations, can be used to solve this kinetic problem. The various macrocyclic antibiotics, or macrolides, like clarithromycin, have an important application. Porphyrins, corrins, and chlorins are just a few examples of the macrocyclic ligands that are bonded to numerous metallocofactors.