Description: Degenerate ring transformations of heterocycles are classified as reactions in which a heterocyclic system is converted into the same heterocyclic system. This monograph covers an authoritative, comprehensive overview of a host of degenerate ring transformations in five- and six-membered heterocycles. It shows how by the use of (15)N-labeled, (13)C-labeled, or selectively substituted compounds these degenerate ring transformations can be discovered and how most of the results can be explained by the Addition Nucleophile, Ring Opening, and Ring Closure (ANRORC) mechanism. Another main topic of Volume 74 is the occurrence of degenerate ring transformations.

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