Chapter 18. Five-Membered Heterocyclic Compounds with Three Hetero-Atoms in the Ring (M. Sainsbury). 1. Triazoles. 1,2,3-Triazoles. Methods of preparation. Physical properties. Chemical reactions and representative compounds. 1,2,4-Trizoles; methods of preparations. Physical properties. Chemical reactions and representative structures. 2. Benzotriazoles. Methods of preparation. Physical properties. Chemical reactions and representative compounds. 3. Oxadiazoles. 1,2,3-Oxadiazoles. 1,2,4-Oxadiazoles (azoximes). 1,3,4-Oxadiazoles. 1,2,5-Oxadiazoles. 2,1,3-Benzoxadiazoles (benzofurazans). 4. Thiadiazoles and benzothiadiazoles. 1,2,3-Thiadiazoles. 1,2,3-Benzothiadiazoles. 1,2,4-Thiadiazoles. 1,2,5-Thiadiazoles. 2,1,3-Benzothiadiazoles (piazthioles). Condensed 1,2,5-thiadiazoles. 1,3,4-Thiadiazoles. 5. Selenadiazoles. 1,2,3-Selenadiazoles. 1,2,4-Selenadiazoles. 1,2,5-Selenadiazoles. 2,1,3-Benzoselenadiazoles. 1,3,4-Selenadiazoles. 6. Dioxazoles. 1,2,4-Diozazoles. 1,3,2-Dioxazoles. 1,4,2-Dioxazoles (1,3,4-dioxazoles). 7. Oxathiazoles. 1,2,3-Oxathiazoles. 1,2,4-Oxathiazolidines. 1,2,5-Oxathiazoles. 1,3,2-Oxathiazoles. 2H-1,3,4-Oxathiazoles ( 4 -1,3,4-Oxathiazoles). 5H-1,4,2-Oxathiazoles ( 2 -1,4,2-oxathiazolines). 8. Dithiazoles, diselenazoles, thiaselenazoles and thiatellurazoles. 1,2,3-Dithiazoles. Benzo-1,2,3-thiaselenazolium and benzo-1,2,3-diselenazolium salts. 1,3,2-Dithiazoles. 1,4,2-Dithiazoles (1,3,4-dithiazoles). 1,2,4-Dithiazoles. 1,2,4-Diselenazoles and related compounds. Chapter 19. Five-Membered Heterocyclic Compounds with Four Hetero-Atoms in the Ring (M. Sainsbury). 1. Tetrazoles. Methods of preparation. Representative tetrazoles. Physical properties and chemical reactions. 2. Oxatriazoles. 3. 1,2,3,4-thiatriazoles. 4. Dioxathiazoles and oxathiazoles. 5. Dithiadiazoles. Index.
