procedures, Science of Synthesis is therefore a unique chemical information tool. Over 1000 world-renowned experts have chosen the most important molecular transformations for a class of organic compounds and elaborated on their scope and limitations. The systematic, logical and consistent organization of the synthetic methods for each functional group enables users to quickly find out which methods are useful for a particular synthesis and which are not. Effective and practical exp erimental procedures can be implemented quickly and easily in the lab. This enables the chemist to get started immediately with the design and planning of a synthesis. www.thieme-chemistry.com/sos