This volume in the series summarizes the varied methods of the synthesis of heterocycles from azadienes with sections covering 1-azadienes, 2-azadienes, and 1,3-diazadienes. It covers the piperazine-2,5-diones and related lactim ethers - comprehensive review of these highly important intermediates for the preparation of a wide variety of natural products. The book explains how 1,2,4-Triazolo [1,5-a] pyrimidines are of particular importance in photography with other significant application in pharmaceuticals and agrochemicals. It also reviews tetramic acids, an importantgroup of natural product. Read more... Content: Front Cover; Advances in Heterocyclic Chemistry, Volume 57; Copyright Page; Contents; CONTRIBUTORS; PREFACE; Chapter 1. Synthesis of Heterocycles from Azadienes; Chapter 2. 1,2,4-Triazolo[1,5-a]pyrimidines; Chapter 3. Advances in Tetramic Acid Chemistry; Chapter 4. Piperazine-2,5-diones and Related Lactim Ethers; Chapter 5. Halogenation of Heterocycles: I. Five-Membered Rings. Abstract: This volume in the series summarizes the varied methods of the synthesis of heterocycles from azadienes with sections covering 1-azadienes, 2-azadienes, and 1,3-diazadienes. It covers the piperazine-2,5-diones and related lactim ethers - comprehensive review of these highly important intermediates for the preparation of a wide variety of natural products. The book explains how 1,2,4-Triazolo [1,5-a] pyrimidines are of particular importance in photography with other significant application in pharmaceuticals and agrochemicals. It also reviews tetramic acids, an importantgroup of natural product