A carefully curated review of the scientific literature, Volume 112 of Organic Reactions commemorates the 50th anniversary of the Ugi reaction. It explores the practical and theoretical aspects of one of the most widely used reactions in organic chemistry, focusing on the main Ugi reaction as well as on its many variants. This volume is published in two parts, A and B.</br> Launched in 1942, the Organic Reactions series today is a leading secondary- and tertiary-level source for organic chemists across the world.</br>
