3.1: Introduction to Neighboring Group Participation, Rearrangements, and Fragmentations This page provides an overview of the three types of reactions covered in this chapter: neighboring group participation, rearrangements, and fragmentations. It shows basic mechanisms for these reactions and highlights structural similarities and differences. 3.2: Neighboring Group Participation This page highlights the importance of intramolecular nucleophiles (including heteroatoms, aromatic rings, and pi bonds) for mechanistic understanding of several interesting reactions. 3.3: Rearrangements This chapter focuses on synthetically useful rearrangements including the pinacol, Payne, benzilic acid, Favorskii, Tiffeneau-Demjanov, Wolff, Curtius, Baeyer-Villager, and Beckmann rearrangements. 3.4: Fragmentations This page focuses on synthetically useful fragmentations including the Grob and Eschenmoser fragmentations.