1. Introduction.- 1.1. Ring-Chain Isomeric Interconversions. General Considerations.- 1.2. Tautomerism or Isomerism? System Mobility and Equilibrium Position.- 1.3. Methods of Investigation of Ring-Chain Addition Tautomerism.- 1.3.1. Chemical Methods.- 1.3.2. Visible and UV Spectroscopy.- 1.3.3. IR Spectroscopy.- 1.3.4. Nuclear Magnetic Resonance.- 1.3.5. Mass Spectrometry.- 1.3.6. X-Ray Diffraction Analysis.- 1.3.7. Polarography.- 1.3.8. Other Physical Methods.- References.- 2. Intramolecular Reversible Addition Reactions to the C=O Group.- 2.1. Aldehydo and Keto-carboxylic Acids and Their Derivatives Modified at the Carboxylic Group.- 2.1.1. Aldehydo- and Keto-carboxylic Acids.- 2.1.2. Acyl Chlorides.- 2.1.3. Amides, Hydrazides, and Amidines.- 2.1.4. Esters.- 2.1.5. Mixed Anhydrides.- 2.2. Hydroxy Aldehydes and Ketones and Related Compounds.- 2.2.1. Derivatives Containing a Hydroxy Group at Carbon (C—OH).- 2.2.2. Derivatives Containing a Hydroxy Group at Nitrogen (N-OH).- 2.3. Amino Aldehydes and Ketones and Related Compounds.- 2.3.1. Covalent Hydration of Nitrogen-Containing Heterocycles.- 2.3.2. Derivatives Containing Amino Groups at sp3-, Aromatic, and sp2-Carbon Atoms.- 2.3.3. Urea and Thiourea Derivatives.- 2.3.4. Dithiocarbamates.- 2.3.5. Sulfonamides and Sulfinamides.- 2.3.6. Pyridones.- 2.3.7. 1,3-Diazaheterocycles.- 2.3.8. Triazenes.- 2.3.9. Miscellaneous.- 2.4. Intramolecular Migration of O-, N-, and S-Acyl Groups.- 2.5. Oxa-, Aza-, and Thiacyclols.- 2.6. Mercapto Aldehydes and Ketones and Related Compounds.- 2.7. Intramolecular Addition of C-H Groups.- References.- 3. Intramolecular Reversible Addition Reactions to the C=N Group.- 3.1. OH-Derivatives of Imines, Hydrazones, Oximes, and Nitrones.- 3.1.1. N-(Hydroxyalkyl) and N-(hydroxyaryl) imines.- 3.1.2. N-Hydroxyalkylhydrazones.- 3.1.3. Hydroxyalkyl and Hydroxyiminoalkyl Nitrones.- 3.1.4. Imines, Hydrazones, and Oximes of Hydroxyaldehydes and Hydroxyketones.- 3.1.5. Imines of Ketocarboxylic Acids.- 3.1.6. Fused Systems.- 3.2. N-H-Derivatives of Imines, Hydrazones, Oximes, and Nitrones.- 3.2.1. N-Aminoalkylimines.- 3.2.2. N-Aminoalkyl and N-Aminoacyl Hydrazones and Related Compounds.- 3.2.3. 2-Benzimidoyl-benzamides and -benzenesulfonamides.- 3.2.4. N-(2- and 3-Hydroxyiminoalkyl)nitrones.- 3.2.5. Fused Systems.- 3.3. S-H-Derivatives of Imines and Hydrazones.- 3.4. Miscellaneous.- References.- 4. Intramolecular Reversible Addition Reactions to Other Groups.- 4.1. Addition to the C?N Group.- 4.2. Addition to C=C and C?C Groups.- 4.3. Addition to the P=O Group.- 4.4. Addition to the P=N Group.- 4.5. Addition to the S=O Group.- 4.6. Addition to the Se=O Group.- 4.7. Addition to the I=O Group.- References.- 5. Generalizations Concerning the Influence of Structural and External Factors on the Relative Stability of Ring and Chain Isomers.- 5.1. Structural Influences.- 5.1.1. Electronic Effects of Substituents at Interacting Groups.- 5.1.2. Steric Effects of Substituents at Interacting Groups.- 5.1.3. Structure of the Connecting Link.- 5.1.4. Steric Effects of the Substituents at the Connecting Link.- 5.1.5. Intramolecular Hydrogen Bonds.- 5.2. Influence of External Factors.- References.
