The present advanced text-cum-reference book is designed not only for advanced undergraduate and graduate students, but also for academic and industrial researchers who work with heterocyclic compounds. It presents a comprehensive account of the syntheses, reactions, properties and applications of all the most significant classes of heterocyclic compounds. Heterocyclic Chemistry has been organised in three volumes. This first volume contains seven chapters: Introduction, Nomenclature, Aromatic Heterocycles, Non-aromatic Heterocycles Heterocyclic Synthesis, Three-membered Heterocycles and Four-membered Heterocycles. Recent developments in hetero- cyclic chemistry are included. The chapter on heterocyclic synthesis presents an account of general synthetic pathways and provides an in-depth guide to synthetic methodology in heterocyclic chemistry. Subject matter is illustrated by a large number of figures and schemes. This book is a valuable tool for graduate students as well as for academic and industrial researchers in organic, medicinal, pharmaceutical, dye and agricultural chemistry.