Preface. Introduction to the fourth edition. Definitions and abbreviations. 1. Structures and spectroscopic properties of aromatic heterocycles, 2. Reactivity of aromatic heterocycles. 3. Synthesis of aromatic heterocycles. 4. Typical reactivity of pyridines, quinolines and isoquinolines. 5. Pyridines: reactions and synthesis. 6. Quinolines and isoquinolines: reactions and synthesis. 7. Typical reactivity of pyrylium and benzopyrylium ions, pyrones and benzopyrones. 8. Pyryliums, 2- and 4-pyrones: reactions and synthesis. 9. Benzopyryliums, benzopyrones: reactions and synthesis. 10. Typical reactivity of the diazines: pyridazine, pyrimidine and pyrazine. 11. The diazines: pyridazine, pyrimidine, and pyrazine: reactions and synthesis. 12. Typical reactivity of pyrroles, thiophenes, and furans. 13. Pyrroles: reactions and synthesis. 14. Thiophenes: reactions and synthesis. 15. Furans: reactions and synthesis. 16. Typical reactivity of indoles, benzo[b]thiophenes, benzo[b]furans, isoindoles, benzo[c]thiophenes and isobenzofurans. 17. Indoles: reactionsand synthesis. 18. Benzo[b]thiophenes and benzo[b]furans: reactions and synthesis. 19. Isoindoles, benzo[c]thiophenes and isobenzofurans: reactions and synthesis. 21. 1,3-Azoles:imidazoles, thiazoles, and oxazoles: reactions and synthesis. 22. 1,2Azoles: pyrazoles, isothiazoles, isoxazoles: reactions and synthesis. 23. Benzanellated azoles: reactions and synthesis. 24. Purines: reactions and synthesis. 25. Heterocycles containing a ring-junction nitrogen. 26. Heterocycles containing more than two hetero atoms. 27. Saturated and partially unsaturated heterocyclic compounds: 28. Heterocycles at work. Appendix: answers to exercises. Index.