This first book dedicated to the topic provides a unique overview of the most important classes of saturated and unsaturated sulfur heterocycles, organized by ring size, and the vital role they play in total synthesis, drug development, and industry. Each chapter contains a description of the nomenclature, structure, stereochemistry, reactivity, design, and common methods of synthesis, as well as physical and biological properties and industrial applications. With its conceptual approach, this is an ideal information source for graduate students and academics interested in natural product chemistry and organic synthesis as well as for researchers in industry working in the area of drug synthesis, agricultural chemistry or materials science.