Front Cover; Advances in Heterocyclic Chemistry, Volume 18; Copyright Page; Contents; Contributors; Preface; Chapter 1. The Chemistry of Isatin; Chapter 2. Thiochromanones and Related Compounds; Chapter 3. Thioureas in the Synthesis of Heterocycles; Chapter 4. Advances in the Chemistry of Chrom-3-enes; Chapter 5. Tautomerism and Electronic Structure of Biological Pyrimidines; Chapter 6. Recent Advances in the Chemistry of Benzo[b]furan and Its Derivatives. Part I: Occurrence and Synthesis; Appendix; Cumulative Index of Titles.