Executive Summary The Dimroth rearrangement is a seminal reaction in organic chemistry, representing an elegant solution for the isomerization of heterocyclic compounds. Discovered by Otto Dimroth in 1909, this reaction is a molecular rearrangement where endocyclic and exocyclic heteroatoms, most commonly nitrogen, switch positions. Its underlying mechanism, a three-stage sequence of Addition, Ring-Opening, and Ring-Closure (ANRORC), distinguishes it from simple intramolecula