This series is intended for the advanced student, the teacher and the active researcher and background for the basic knowledge in the field of stereochemistry is assumed. Each chapter is written by an expert in the field and covers its subject in depth. The authors have chosen topics of fundamental import aimed primarily at an audience of organic chemists but involved frequently with fundamental principles of physical chemistry and molecular physics, and dealing also with certain stereochemical aspects of inorganic chemistry and biochemistry. This is the 19th volume in this ongoing series. It will benefit all organic chemists working with stereochemistry in academic and industrial areas.