Advances in Physical Organic Chemistry, Volume 56 presents the latest reviews of recent work in physical organic chemistry. The book provides a valuable source of information that is ideal not only for physical organic chemists applying their expertise to both novel and traditional problems, but also for non-specialists across diverse areas who identify a physical organic component in their approach to research. Chapters due to be included in this release cover flavin-dependent enzyme catalysed reactions, coacervates and their properties, heavy atom tunnelling, machine learning, acidity and substituent effects.