Front Cover; Advances in Heterocyclic Chemistry, Volume 59; Copyright Page; Contents; Contributors; Preface; Chapter 1. Recent Advances in Fluoroheterocyclic Chemistry; I. Introduction; II. Synthesis; III. Properties and Reactions; References; Chapter 2. Condensed 1,2,4-Triazines: I. Fused to Heterocycles with Three-, Four-, and Five-Membered Rings; I. Introduction; II. Azirino[ 1,2,4]triazines, Azirino[ x, y-z] [ 1,2,4] triazines, and Azirino[1,2-d][l,2,4]triazines; III. Azeto[l,2,4]triazines; IV. Pyrrolo and Indolo [1,2,4,]triazines; V. Furo[ 1,2,4]triazines; VI. Thieno[1,2,4]triazines

VII. Diazolo[l,2,4]triazinesVIII. Oxazolo[l,2,4,]triazines; IX. Thiazolo[l,2,4]triazines; X. Triazolo[1,2,4]triazines; XI. Oxadiazolo[1,2,4]triazines; XII. Thiadiazolo[1,2,4]triazines; XIII. Tetrazolo[1,2,4]triazines; Appendix; References; Chapter 3. Developments in the Chemistry of Thiopyrans, Selenopyrans, and Teluropyrans; I . Introduction; II. Nomenclature; III. Synthesis from Acyclic Precursors; IV. Synthesis from Cyclic Precursors; V. Reactions; VI. Physical Properties and Theoretical Chemistry; VII. Miscellaneous Properties; References.

Chapter 4. Halogenation of Heterocycles: III. Heterocycles Fused to Other Aromatic or Heteroaromatic RingsI . Introduction; II. Halogenation of Condensed Heterocycles; References