Mechanistic considerations now hold a firm place in organic chemistry: What factors influence the reactivity of a molecule? What typical reaction principles and patterns exist, and what steps do organic chemical reactions follow? How can reactions be controlled? Using modern and preparatively useful reactions, the author explains the principles of reactions; concepts are clearly and understandably developed, with stereochemical consequences always derived. The author provides rules of thumb for estimating reactivity as well as practical tips and tricks. The two-color design enhances clarity and makes it easier to follow the mechanisms. In this 3rd edition, errors in text and graphics have been corrected following the overwhelming sales success of the 2nd edition, and the literature has been updated once again.